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hsmusic-wiki - HSMusic - static wiki software cataloguing collaborative creation
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-rw-r--r--src/data/composite/control-flow/exposeWhetherDependencyAvailable.js42
-rw-r--r--src/data/composite/control-flow/index.js1
-rw-r--r--src/data/composite/control-flow/withResultOfAvailabilityCheck.js1
-rw-r--r--src/data/composite/data/excludeFromList.js5
-rw-r--r--src/data/composite/data/fillMissingListItems.js5
-rw-r--r--src/data/composite/data/index.js29
-rw-r--r--src/data/composite/data/withFilteredList.js6
-rw-r--r--src/data/composite/data/withFlattenedList.js6
-rw-r--r--src/data/composite/data/withIndexInList.js38
-rw-r--r--src/data/composite/data/withMappedList.js6
-rw-r--r--src/data/composite/data/withNearbyItemFromList.js73
-rw-r--r--src/data/composite/data/withPropertiesFromList.js6
-rw-r--r--src/data/composite/data/withPropertyFromList.js6
-rw-r--r--src/data/composite/data/withPropertyFromObject.js28
-rw-r--r--src/data/composite/data/withSortedList.js6
-rw-r--r--src/data/composite/data/withSum.js33
-rw-r--r--src/data/composite/data/withUnflattenedList.js6
-rw-r--r--src/data/composite/things/album/index.js1
-rw-r--r--src/data/composite/things/album/withTrackSections.js21
-rw-r--r--src/data/composite/things/album/withTracks.js13
-rw-r--r--src/data/composite/things/artist/artistTotalDuration.js70
-rw-r--r--src/data/composite/things/artist/index.js1
-rw-r--r--src/data/composite/things/contribution/index.js7
-rw-r--r--src/data/composite/things/contribution/inheritFromContributionPresets.js61
-rw-r--r--src/data/composite/things/contribution/thingPropertyMatches.js33
-rw-r--r--src/data/composite/things/contribution/thingReferenceTypeMatches.js39
-rw-r--r--src/data/composite/things/contribution/withContainingReverseContributionList.js40
-rw-r--r--src/data/composite/things/contribution/withContributionArtist.js34
-rw-r--r--src/data/composite/things/contribution/withContributionContext.js45
-rw-r--r--src/data/composite/things/contribution/withMatchingContributionPresets.js70
-rw-r--r--src/data/composite/things/track/index.js4
-rw-r--r--src/data/composite/things/track/inheritContributionListFromOriginalRelease.js44
-rw-r--r--src/data/composite/things/track/withContainingTrackSection.js1
-rw-r--r--src/data/composite/things/track/withDate.js34
-rw-r--r--src/data/composite/things/track/withHasUniqueCoverArt.js5
-rw-r--r--src/data/composite/things/track/withTrackArtDate.js80
-rw-r--r--src/data/composite/wiki-data/exitWithoutContribs.js1
-rw-r--r--src/data/composite/wiki-data/index.js5
-rw-r--r--src/data/composite/wiki-data/withClonedThings.js68
-rw-r--r--src/data/composite/wiki-data/withContributionListSums.js95
-rw-r--r--src/data/composite/wiki-data/withCoverArtDate.js70
-rw-r--r--src/data/composite/wiki-data/withRecontextualizedContributionList.js101
-rw-r--r--src/data/composite/wiki-data/withRedatedContributionList.js127
-rw-r--r--src/data/composite/wiki-data/withResolvedContribs.js115
-rw-r--r--src/data/composite/wiki-data/withReverseContributionList.js120
-rw-r--r--src/data/composite/wiki-data/withReverseReferenceList.js111
-rw-r--r--src/data/composite/wiki-properties/contributionList.js31
-rw-r--r--src/data/composite/wiki-properties/index.js1
-rw-r--r--src/data/composite/wiki-properties/thing.js31
49 files changed, 1641 insertions, 135 deletions
diff --git a/src/data/composite/control-flow/exposeWhetherDependencyAvailable.js b/src/data/composite/control-flow/exposeWhetherDependencyAvailable.js
new file mode 100644
index 00000000..a2fdd6b0
--- /dev/null
+++ b/src/data/composite/control-flow/exposeWhetherDependencyAvailable.js
@@ -0,0 +1,42 @@
+// Exposes true if a dependency is available, and false otherwise,
+// or the reverse if the `negate` input is set true.
+//
+// See withResultOfAvailabilityCheck for {mode} options.
+
+import {input, templateCompositeFrom} from '#composite';
+
+import inputAvailabilityCheckMode from './inputAvailabilityCheckMode.js';
+import withResultOfAvailabilityCheck from './withResultOfAvailabilityCheck.js';
+
+export default templateCompositeFrom({
+  annotation: `exposeWhetherDependencyAvailable`,
+
+  compose: false,
+
+  inputs: {
+    dependency: input({acceptsNull: true}),
+
+    mode: inputAvailabilityCheckMode(),
+
+    negate: input({type: 'boolean', defaultValue: false}),
+  },
+
+  steps: () => [
+    withResultOfAvailabilityCheck({
+      from: input('dependency'),
+      mode: input('mode'),
+    }),
+
+    {
+      dependencies: ['#availability', input('negate')],
+
+      compute: ({
+        ['#availability']: availability,
+        [input('negate')]: negate,
+      }) =>
+        (negate
+          ? !availability
+          : availability),
+    },
+  ],
+});
diff --git a/src/data/composite/control-flow/index.js b/src/data/composite/control-flow/index.js
index 7fad88b2..6148d465 100644
--- a/src/data/composite/control-flow/index.js
+++ b/src/data/composite/control-flow/index.js
@@ -9,6 +9,7 @@ export {default as exposeConstant} from './exposeConstant.js';
 export {default as exposeDependency} from './exposeDependency.js';
 export {default as exposeDependencyOrContinue} from './exposeDependencyOrContinue.js';
 export {default as exposeUpdateValueOrContinue} from './exposeUpdateValueOrContinue.js';
+export {default as exposeWhetherDependencyAvailable} from './exposeWhetherDependencyAvailable.js';
 export {default as raiseOutputWithoutDependency} from './raiseOutputWithoutDependency.js';
 export {default as raiseOutputWithoutUpdateValue} from './raiseOutputWithoutUpdateValue.js';
 export {default as withResultOfAvailabilityCheck} from './withResultOfAvailabilityCheck.js';
diff --git a/src/data/composite/control-flow/withResultOfAvailabilityCheck.js b/src/data/composite/control-flow/withResultOfAvailabilityCheck.js
index a6942014..1d90b324 100644
--- a/src/data/composite/control-flow/withResultOfAvailabilityCheck.js
+++ b/src/data/composite/control-flow/withResultOfAvailabilityCheck.js
@@ -17,6 +17,7 @@
 //  - exitWithoutUpdateValue
 //  - exposeDependencyOrContinue
 //  - exposeUpdateValueOrContinue
+//  - exposeWhetherDependencyAvailable
 //  - raiseOutputWithoutDependency
 //  - raiseOutputWithoutUpdateValue
 //
diff --git a/src/data/composite/data/excludeFromList.js b/src/data/composite/data/excludeFromList.js
index d798dcdc..2a3e818e 100644
--- a/src/data/composite/data/excludeFromList.js
+++ b/src/data/composite/data/excludeFromList.js
@@ -5,11 +5,6 @@
 // See also:
 //  - fillMissingListItems
 //
-// More list utilities:
-//  - withFilteredList, withMappedList, withSortedList
-//  - withFlattenedList, withUnflattenedList
-//  - withPropertyFromList, withPropertiesFromList
-//
 
 import {input, templateCompositeFrom} from '#composite';
 import {empty} from '#sugar';
diff --git a/src/data/composite/data/fillMissingListItems.js b/src/data/composite/data/fillMissingListItems.js
index 4f818a79..356b1119 100644
--- a/src/data/composite/data/fillMissingListItems.js
+++ b/src/data/composite/data/fillMissingListItems.js
@@ -4,11 +4,6 @@
 // See also:
 //  - excludeFromList
 //
-// More list utilities:
-//  - withFilteredList, withMappedList, withSortedList
-//  - withFlattenedList, withUnflattenedList
-//  - withPropertyFromList, withPropertiesFromList
-//
 
 import {input, templateCompositeFrom} from '#composite';
 
diff --git a/src/data/composite/data/index.js b/src/data/composite/data/index.js
index 256c0490..c80bb350 100644
--- a/src/data/composite/data/index.js
+++ b/src/data/composite/data/index.js
@@ -3,15 +3,32 @@
 // Entries here may depend on entries in #composite/control-flow.
 //
 
+// Utilities which act on generic objects
+
+export {default as withPropertiesFromObject} from './withPropertiesFromObject.js';
+export {default as withPropertyFromObject} from './withPropertyFromObject.js';
+
+// Utilities which act on generic lists
+
 export {default as excludeFromList} from './excludeFromList.js';
+
 export {default as fillMissingListItems} from './fillMissingListItems.js';
+export {default as withUniqueItemsOnly} from './withUniqueItemsOnly.js';
+
 export {default as withFilteredList} from './withFilteredList.js';
-export {default as withFlattenedList} from './withFlattenedList.js';
 export {default as withMappedList} from './withMappedList.js';
-export {default as withPropertiesFromList} from './withPropertiesFromList.js';
-export {default as withPropertiesFromObject} from './withPropertiesFromObject.js';
-export {default as withPropertyFromList} from './withPropertyFromList.js';
-export {default as withPropertyFromObject} from './withPropertyFromObject.js';
 export {default as withSortedList} from './withSortedList.js';
+
+export {default as withPropertyFromList} from './withPropertyFromList.js';
+export {default as withPropertiesFromList} from './withPropertiesFromList.js';
+
+export {default as withFlattenedList} from './withFlattenedList.js';
 export {default as withUnflattenedList} from './withUnflattenedList.js';
-export {default as withUniqueItemsOnly} from './withUniqueItemsOnly.js';
+
+export {default as withIndexInList} from './withIndexInList.js';
+export {default as withNearbyItemFromList} from './withNearbyItemFromList.js';
+
+// Utilities which act on slightly more particular data forms
+// (probably, containers of particular kinds of values)
+
+export {default as withSum} from './withSum.js';
diff --git a/src/data/composite/data/withFilteredList.js b/src/data/composite/data/withFilteredList.js
index 82e56903..60fe66f4 100644
--- a/src/data/composite/data/withFilteredList.js
+++ b/src/data/composite/data/withFilteredList.js
@@ -16,12 +16,6 @@
 //  - withMappedList
 //  - withSortedList
 //
-// More list utilities:
-//  - excludeFromList
-//  - fillMissingListItems
-//  - withFlattenedList, withUnflattenedList
-//  - withPropertyFromList, withPropertiesFromList
-//
 
 import {input, templateCompositeFrom} from '#composite';
 
diff --git a/src/data/composite/data/withFlattenedList.js b/src/data/composite/data/withFlattenedList.js
index edfa3403..31b1a742 100644
--- a/src/data/composite/data/withFlattenedList.js
+++ b/src/data/composite/data/withFlattenedList.js
@@ -5,12 +5,6 @@
 // See also:
 //  - withUnflattenedList
 //
-// More list utilities:
-//  - excludeFromList
-//  - fillMissingListItems
-//  - withFilteredList, withMappedList, withSortedList
-//  - withPropertyFromList, withPropertiesFromList
-//
 
 import {input, templateCompositeFrom} from '#composite';
 
diff --git a/src/data/composite/data/withIndexInList.js b/src/data/composite/data/withIndexInList.js
new file mode 100644
index 00000000..b1af2033
--- /dev/null
+++ b/src/data/composite/data/withIndexInList.js
@@ -0,0 +1,38 @@
+// Gets the index of the provided item in the provided list. Note that this
+// will output -1 if the item is not found, and this may be detected using
+// any availability check with type: 'index'. If the list includes the item
+// twice, the output index will be of the first match.
+//
+// Both the list and item must be provided.
+//
+// See also:
+//  - withNearbyItemFromList
+//  - exitWithoutDependency
+//  - raiseOutputWithoutDependency
+//
+
+import {input, templateCompositeFrom} from '#composite';
+
+export default templateCompositeFrom({
+  annotation: `withIndexInList`,
+
+  inputs: {
+    list: input({acceptsNull: false, type: 'array'}),
+    item: input({acceptsNull: false}),
+  },
+
+  outputs: ['#index'],
+
+  steps: () => [
+    {
+      dependencies: [input('list'), input('item')],
+      compute: (continuation, {
+        [input('list')]: list,
+        [input('item')]: item,
+      }) => continuation({
+        ['#index']:
+          list.indexOf(item),
+      }),
+    },
+  ],
+});
diff --git a/src/data/composite/data/withMappedList.js b/src/data/composite/data/withMappedList.js
index e0a700b2..0bc63a92 100644
--- a/src/data/composite/data/withMappedList.js
+++ b/src/data/composite/data/withMappedList.js
@@ -5,12 +5,6 @@
 //  - withFilteredList
 //  - withSortedList
 //
-// More list utilities:
-//  - excludeFromList
-//  - fillMissingListItems
-//  - withFlattenedList, withUnflattenedList
-//  - withPropertyFromList, withPropertiesFromList
-//
 
 import {input, templateCompositeFrom} from '#composite';
 
diff --git a/src/data/composite/data/withNearbyItemFromList.js b/src/data/composite/data/withNearbyItemFromList.js
new file mode 100644
index 00000000..83a8cc21
--- /dev/null
+++ b/src/data/composite/data/withNearbyItemFromList.js
@@ -0,0 +1,73 @@
+// Gets a nearby (typically adjacent) item in a list, meaning the item which is
+// placed at a particular offset compared to the provided item. This is null if
+// the provided list doesn't include the provided item at all, and also if the
+// offset would read past either end of the list - except if configured:
+//
+//  - If the 'wrap' input is provided (as true), the offset will loop around
+//    and continue from the opposing end.
+//
+//  - If the 'valuePastEdge' input is provided, that value will be output
+//    instead of null.
+//
+// Both the list and item must be provided.
+//
+// See also:
+//  - withIndexInList
+//
+
+import {input, templateCompositeFrom} from '#composite';
+import {atOffset} from '#sugar';
+
+import {raiseOutputWithoutDependency} from '#composite/control-flow';
+
+import withIndexInList from './withIndexInList.js';
+
+export default templateCompositeFrom({
+  annotation: `withNearbyItemFromList`,
+
+  inputs: {
+    list: input({acceptsNull: false, type: 'array'}),
+    item: input({acceptsNull: false}),
+
+    offset: input({type: 'number'}),
+    wrap: input({type: 'boolean', defaultValue: false}),
+  },
+
+  outputs: ['#nearbyItem'],
+
+  steps: () => [
+    withIndexInList({
+      list: input('list'),
+      item: input('item'),
+    }),
+
+    raiseOutputWithoutDependency({
+      dependency: '#index',
+      mode: input.value('index'),
+
+      output: input.value({
+        ['#nearbyItem']:
+          null,
+      }),
+    }),
+
+    {
+      dependencies: [
+        input('list'),
+        input('offset'),
+        input('wrap'),
+        '#index',
+      ],
+
+      compute: (continuation, {
+        [input('list')]: list,
+        [input('offset')]: offset,
+        [input('wrap')]: wrap,
+        ['#index']: index,
+      }) => continuation({
+        ['#nearbyItem']:
+          atOffset(list, index, offset, {wrap}),
+      }),
+    },
+  ],
+});
diff --git a/src/data/composite/data/withPropertiesFromList.js b/src/data/composite/data/withPropertiesFromList.js
index 08907bab..fb4134bc 100644
--- a/src/data/composite/data/withPropertiesFromList.js
+++ b/src/data/composite/data/withPropertiesFromList.js
@@ -8,12 +8,6 @@
 //  - withPropertiesFromObject
 //  - withPropertyFromList
 //
-// More list utilities:
-//  - excludeFromList
-//  - fillMissingListItems
-//  - withFilteredList, withMappedList, withSortedList
-//  - withFlattenedList, withUnflattenedList
-//
 
 import {input, templateCompositeFrom} from '#composite';
 import {isString, validateArrayItems} from '#validators';
diff --git a/src/data/composite/data/withPropertyFromList.js b/src/data/composite/data/withPropertyFromList.js
index a2c66d77..65ebf77b 100644
--- a/src/data/composite/data/withPropertyFromList.js
+++ b/src/data/composite/data/withPropertyFromList.js
@@ -9,12 +9,6 @@
 //  - withPropertiesFromList
 //  - withPropertyFromObject
 //
-// More list utilities:
-//  - excludeFromList
-//  - fillMissingListItems
-//  - withFilteredList, withMappedList, withSortedList
-//  - withFlattenedList, withUnflattenedList
-//
 
 import {input, templateCompositeFrom} from '#composite';
 
diff --git a/src/data/composite/data/withPropertyFromObject.js b/src/data/composite/data/withPropertyFromObject.js
index b31bab15..4f240506 100644
--- a/src/data/composite/data/withPropertyFromObject.js
+++ b/src/data/composite/data/withPropertyFromObject.js
@@ -2,11 +2,15 @@
 // If the object itself is null, or the object doesn't have the listed property,
 // the provided dependency will also be null.
 //
+// If the `internal` input is true, this reads the CacheableObject update value
+// of the object rather than its exposed value.
+//
 // See also:
 //  - withPropertiesFromObject
 //  - withPropertyFromList
 //
 
+import CacheableObject from '#cacheable-object';
 import {input, templateCompositeFrom} from '#composite';
 
 export default templateCompositeFrom({
@@ -15,6 +19,7 @@ export default templateCompositeFrom({
   inputs: {
     object: input({type: 'object', acceptsNull: true}),
     property: input({type: 'string'}),
+    internal: input({type: 'boolean', defaultValue: false}),
   },
 
   outputs: ({
@@ -49,20 +54,35 @@ export default templateCompositeFrom({
 
     {
       dependencies: [
-        '#output',
         input('object'),
         input('property'),
+        input('internal'),
       ],
 
       compute: (continuation, {
-        ['#output']: output,
         [input('object')]: object,
         [input('property')]: property,
+        [input('internal')]: internal,
       }) => continuation({
-        [output]:
+        '#value':
           (object === null
             ? null
-            : object[property] ?? null),
+         : internal
+            ? CacheableObject.getUpdateValue(object, property)
+                ?? null
+            : object[property]
+                ?? null),
+      }),
+    },
+
+    {
+      dependencies: ['#output', '#value'],
+
+      compute: (continuation, {
+        ['#output']: output,
+        ['#value']: value,
+      }) => continuation({
+        [output]: value,
       }),
     },
   ],
diff --git a/src/data/composite/data/withSortedList.js b/src/data/composite/data/withSortedList.js
index dd810786..a7d21768 100644
--- a/src/data/composite/data/withSortedList.js
+++ b/src/data/composite/data/withSortedList.js
@@ -27,12 +27,6 @@
 //  - withFilteredList
 //  - withMappedList
 //
-// More list utilities:
-//  - excludeFromList
-//  - fillMissingListItems
-//  - withFlattenedList, withUnflattenedList
-//  - withPropertyFromList, withPropertiesFromList
-//
 
 import {input, templateCompositeFrom} from '#composite';
 
diff --git a/src/data/composite/data/withSum.js b/src/data/composite/data/withSum.js
new file mode 100644
index 00000000..484e9906
--- /dev/null
+++ b/src/data/composite/data/withSum.js
@@ -0,0 +1,33 @@
+// Gets the numeric total of adding all the values in a list together.
+// Values that are false, null, or undefined are skipped over.
+
+import {input, templateCompositeFrom} from '#composite';
+import {isNumber, sparseArrayOf} from '#validators';
+
+export default templateCompositeFrom({
+  annotation: `withSum`,
+
+  inputs: {
+    values: input({
+      validate: sparseArrayOf(isNumber),
+    }),
+  },
+
+  outputs: ['#sum'],
+
+  steps: () => [
+    {
+      dependencies: [input('values')],
+      compute: (continuation, {
+        [input('values')]: values,
+      }) => continuation({
+        ['#sum']:
+          values
+            .filter(item => typeof item === 'number')
+            .reduce(
+              (accumulator, value) => accumulator + value,
+              0),
+      }),
+    },
+  ],
+});
diff --git a/src/data/composite/data/withUnflattenedList.js b/src/data/composite/data/withUnflattenedList.js
index 39a666dc..820d628a 100644
--- a/src/data/composite/data/withUnflattenedList.js
+++ b/src/data/composite/data/withUnflattenedList.js
@@ -7,12 +7,6 @@
 // See also:
 //  - withFlattenedList
 //
-// More list utilities:
-//  - excludeFromList
-//  - fillMissingListItems
-//  - withFilteredList, withMappedList, withSortedList
-//  - withPropertyFromList, withPropertiesFromList
-//
 
 import {input, templateCompositeFrom} from '#composite';
 import {isWholeNumber, validateArrayItems} from '#validators';
diff --git a/src/data/composite/things/album/index.js b/src/data/composite/things/album/index.js
index 8b5098f0..0ef91b87 100644
--- a/src/data/composite/things/album/index.js
+++ b/src/data/composite/things/album/index.js
@@ -1 +1,2 @@
+export {default as withTrackSections} from './withTrackSections.js';
 export {default as withTracks} from './withTracks.js';
diff --git a/src/data/composite/things/album/withTrackSections.js b/src/data/composite/things/album/withTrackSections.js
new file mode 100644
index 00000000..a56bda31
--- /dev/null
+++ b/src/data/composite/things/album/withTrackSections.js
@@ -0,0 +1,21 @@
+import {input, templateCompositeFrom} from '#composite';
+
+import find from '#find';
+
+import {withResolvedReferenceList} from '#composite/wiki-data';
+
+export default templateCompositeFrom({
+  annotation: `withTrackSections`,
+
+  outputs: ['#trackSections'],
+
+  steps: () => [
+    withResolvedReferenceList({
+      list: 'trackSections',
+      data: 'ownTrackSectionData',
+      find: input.value(find.unqualifiedTrackSection),
+    }).outputs({
+      ['#resolvedReferenceList']: '#trackSections',
+    }),
+  ],
+});
diff --git a/src/data/composite/things/album/withTracks.js b/src/data/composite/things/album/withTracks.js
index 3fe6dd2e..c8d27c4c 100644
--- a/src/data/composite/things/album/withTracks.js
+++ b/src/data/composite/things/album/withTracks.js
@@ -1,24 +1,17 @@
 import {input, templateCompositeFrom} from '#composite';
 
-import find from '#find';
-
-import {exitWithoutDependency} from '#composite/control-flow';
 import {withFlattenedList, withPropertyFromList} from '#composite/data';
 import {withResolvedReferenceList} from '#composite/wiki-data';
 
+import withTrackSections from './withTrackSections.js';
+
 export default templateCompositeFrom({
   annotation: `withTracks`,
 
   outputs: ['#tracks'],
 
   steps: () => [
-    withResolvedReferenceList({
-      list: 'trackSections',
-      data: 'ownTrackSectionData',
-      find: input.value(find.unqualifiedTrackSection),
-    }).outputs({
-      ['#resolvedReferenceList']: '#trackSections',
-    }),
+    withTrackSections(),
 
     withPropertyFromList({
       list: '#trackSections',
diff --git a/src/data/composite/things/artist/artistTotalDuration.js b/src/data/composite/things/artist/artistTotalDuration.js
new file mode 100644
index 00000000..ff709f28
--- /dev/null
+++ b/src/data/composite/things/artist/artistTotalDuration.js
@@ -0,0 +1,70 @@
+import {input, templateCompositeFrom} from '#composite';
+
+import {exposeDependency} from '#composite/control-flow';
+import {withFilteredList, withPropertyFromList} from '#composite/data';
+import {withContributionListSums, withReverseContributionList}
+  from '#composite/wiki-data';
+
+export default templateCompositeFrom({
+  annotation: `artistTotalDuration`,
+
+  compose: false,
+
+  steps: () => [
+    withReverseContributionList({
+      data: 'trackData',
+      list: input.value('artistContribs'),
+    }).outputs({
+      '#reverseContributionList': '#contributionsAsArtist',
+    }),
+
+    withReverseContributionList({
+      data: 'trackData',
+      list: input.value('contributorContribs'),
+    }).outputs({
+      '#reverseContributionList': '#contributionsAsContributor',
+    }),
+
+    {
+      dependencies: [
+        '#contributionsAsArtist',
+        '#contributionsAsContributor',
+      ],
+
+      compute: (continuation, {
+        ['#contributionsAsArtist']: artistContribs,
+        ['#contributionsAsContributor']: contributorContribs,
+      }) => continuation({
+        ['#allContributions']: [
+          ...artistContribs,
+          ...contributorContribs,
+        ],
+      }),
+    },
+
+    withPropertyFromList({
+      list: '#allContributions',
+      property: input.value('thing'),
+    }),
+
+    withPropertyFromList({
+      list: '#allContributions.thing',
+      property: input.value('isOriginalRelease'),
+    }),
+
+    withFilteredList({
+      list: '#allContributions',
+      filter: '#allContributions.thing.isOriginalRelease',
+    }).outputs({
+      '#filteredList': '#originalContributions',
+    }),
+
+    withContributionListSums({
+      list: '#originalContributions',
+    }),
+
+    exposeDependency({
+      dependency: '#contributionListDuration',
+    }),
+  ],
+});
diff --git a/src/data/composite/things/artist/index.js b/src/data/composite/things/artist/index.js
new file mode 100644
index 00000000..55514c71
--- /dev/null
+++ b/src/data/composite/things/artist/index.js
@@ -0,0 +1 @@
+export {default as artistTotalDuration} from './artistTotalDuration.js';
diff --git a/src/data/composite/things/contribution/index.js b/src/data/composite/things/contribution/index.js
new file mode 100644
index 00000000..9b22be2e
--- /dev/null
+++ b/src/data/composite/things/contribution/index.js
@@ -0,0 +1,7 @@
+export {default as inheritFromContributionPresets} from './inheritFromContributionPresets.js';
+export {default as thingPropertyMatches} from './thingPropertyMatches.js';
+export {default as thingReferenceTypeMatches} from './thingReferenceTypeMatches.js';
+export {default as withContainingReverseContributionList} from './withContainingReverseContributionList.js';
+export {default as withContributionArtist} from './withContributionArtist.js';
+export {default as withContributionContext} from './withContributionContext.js';
+export {default as withMatchingContributionPresets} from './withMatchingContributionPresets.js';
diff --git a/src/data/composite/things/contribution/inheritFromContributionPresets.js b/src/data/composite/things/contribution/inheritFromContributionPresets.js
new file mode 100644
index 00000000..82425b9c
--- /dev/null
+++ b/src/data/composite/things/contribution/inheritFromContributionPresets.js
@@ -0,0 +1,61 @@
+import {input, templateCompositeFrom} from '#composite';
+
+import {raiseOutputWithoutDependency} from '#composite/control-flow';
+import {withPropertyFromList, withPropertyFromObject} from '#composite/data';
+
+import withMatchingContributionPresets
+  from './withMatchingContributionPresets.js';
+
+export default templateCompositeFrom({
+  annotation: `inheritFromContributionPresets`,
+
+  inputs: {
+    property: input({type: 'string'}),
+  },
+
+  steps: () => [
+    withMatchingContributionPresets().outputs({
+      '#matchingContributionPresets': '#presets',
+    }),
+
+    raiseOutputWithoutDependency({
+      dependency: '#presets',
+      mode: input.value('empty'),
+    }),
+
+    withPropertyFromList({
+      list: '#presets',
+      property: input('property'),
+    }),
+
+    {
+      dependencies: ['#values'],
+
+      compute: (continuation, {
+        ['#values']: values,
+      }) => continuation({
+        ['#index']:
+          values.findIndex(value =>
+            value !== undefined &&
+            value !== null),
+      }),
+    },
+
+    raiseOutputWithoutDependency({
+      dependency: '#index',
+      mode: input.value('index'),
+    }),
+
+    {
+      dependencies: ['#values', '#index'],
+
+      compute: (continuation, {
+        ['#values']: values,
+        ['#index']: index,
+      }) => continuation({
+        ['#value']:
+          values[index],
+      }),
+    },
+  ],
+});
diff --git a/src/data/composite/things/contribution/thingPropertyMatches.js b/src/data/composite/things/contribution/thingPropertyMatches.js
new file mode 100644
index 00000000..4a37f2cf
--- /dev/null
+++ b/src/data/composite/things/contribution/thingPropertyMatches.js
@@ -0,0 +1,33 @@
+import {input, templateCompositeFrom} from '#composite';
+
+import {exitWithoutDependency} from '#composite/control-flow';
+
+export default templateCompositeFrom({
+  annotation: `thingPropertyMatches`,
+
+  compose: false,
+
+  inputs: {
+    value: input({type: 'string'}),
+  },
+
+  steps: () => [
+    exitWithoutDependency({
+      dependency: 'thingProperty',
+      value: input.value(false),
+    }),
+
+    {
+      dependencies: [
+        'thingProperty',
+        input('value'),
+      ],
+
+      compute: ({
+        ['thingProperty']: thingProperty,
+        [input('value')]: value,
+      }) =>
+        thingProperty === value,
+    },
+  ],
+});
diff --git a/src/data/composite/things/contribution/thingReferenceTypeMatches.js b/src/data/composite/things/contribution/thingReferenceTypeMatches.js
new file mode 100644
index 00000000..2ee811af
--- /dev/null
+++ b/src/data/composite/things/contribution/thingReferenceTypeMatches.js
@@ -0,0 +1,39 @@
+import {input, templateCompositeFrom} from '#composite';
+
+import {exitWithoutDependency} from '#composite/control-flow';
+import {withPropertyFromObject} from '#composite/data';
+
+export default templateCompositeFrom({
+  annotation: `thingReferenceTypeMatches`,
+
+  compose: false,
+
+  inputs: {
+    value: input({type: 'string'}),
+  },
+
+  steps: () => [
+    exitWithoutDependency({
+      dependency: 'thing',
+      value: input.value(false),
+    }),
+
+    withPropertyFromObject({
+      object: 'thing',
+      property: input.value('constructor'),
+    }),
+
+    {
+      dependencies: [
+        '#thing.constructor',
+        input('value'),
+      ],
+
+      compute: ({
+        ['#thing.constructor']: constructor,
+        [input('value')]: value,
+      }) =>
+        constructor[Symbol.for('Thing.referenceType')] === value,
+    },
+  ],
+});
diff --git a/src/data/composite/things/contribution/withContainingReverseContributionList.js b/src/data/composite/things/contribution/withContainingReverseContributionList.js
new file mode 100644
index 00000000..56704c8b
--- /dev/null
+++ b/src/data/composite/things/contribution/withContainingReverseContributionList.js
@@ -0,0 +1,40 @@
+// Get the artist's contribution list containing this property.
+
+import {input, templateCompositeFrom} from '#composite';
+
+import {raiseOutputWithoutDependency} from '#composite/control-flow';
+import {withPropertyFromObject} from '#composite/data';
+
+import withContributionArtist from './withContributionArtist.js';
+
+export default templateCompositeFrom({
+  annotation: `withContainingReverseContributionList`,
+
+  inputs: {
+    artistProperty: input({
+      defaultDependency: 'artistProperty',
+      acceptsNull: true,
+    }),
+  },
+
+  outputs: ['#containingReverseContributionList'],
+
+  steps: () => [
+    raiseOutputWithoutDependency({
+      dependency: input('artistProperty'),
+      output: input.value({
+        ['#containingReverseContributionList']:
+          null,
+      }),
+    }),
+
+    withContributionArtist(),
+
+    withPropertyFromObject({
+      object: '#artist',
+      property: input('artistProperty'),
+    }).outputs({
+      ['#value']: '#containingReverseContributionList',
+    }),
+  ],
+});
diff --git a/src/data/composite/things/contribution/withContributionArtist.js b/src/data/composite/things/contribution/withContributionArtist.js
new file mode 100644
index 00000000..5a611c1a
--- /dev/null
+++ b/src/data/composite/things/contribution/withContributionArtist.js
@@ -0,0 +1,34 @@
+import {input, templateCompositeFrom} from '#composite';
+import find from '#find';
+
+import {withPropertyFromObject} from '#composite/data';
+import {withResolvedReference} from '#composite/wiki-data';
+
+export default templateCompositeFrom({
+  annotation: `withContributionArtist`,
+
+  inputs: {
+    ref: input({
+      type: 'string',
+      defaultDependency: 'artist',
+    }),
+  },
+
+  outputs: ['#artist'],
+
+  steps: () => [
+    withPropertyFromObject({
+      object: 'thing',
+      property: input.value('artistData'),
+      internal: input.value(true),
+    }),
+
+    withResolvedReference({
+      ref: input('ref'),
+      data: '#thing.artistData',
+      find: input.value(find.artist),
+    }).outputs({
+      '#resolvedReference': '#artist',
+    }),
+  ],
+});
diff --git a/src/data/composite/things/contribution/withContributionContext.js b/src/data/composite/things/contribution/withContributionContext.js
new file mode 100644
index 00000000..3c1c31c0
--- /dev/null
+++ b/src/data/composite/things/contribution/withContributionContext.js
@@ -0,0 +1,45 @@
+import {input, templateCompositeFrom} from '#composite';
+
+import {raiseOutputWithoutDependency} from '#composite/control-flow';
+
+export default templateCompositeFrom({
+  annotation: `withContributionContext`,
+
+  outputs: [
+    '#contributionTarget',
+    '#contributionProperty',
+  ],
+
+  steps: () => [
+    raiseOutputWithoutDependency({
+      dependency: 'thing',
+      output: input.value({
+        '#contributionTarget': null,
+        '#contributionProperty': null,
+      }),
+    }),
+
+    raiseOutputWithoutDependency({
+      dependency: 'thingProperty',
+      output: input.value({
+        '#contributionTarget': null,
+        '#contributionProperty': null,
+      }),
+    }),
+
+    {
+      dependencies: ['thing', 'thingProperty'],
+
+      compute: (continuation, {
+        ['thing']: thing,
+        ['thingProperty']: thingProperty,
+      }) => continuation({
+        ['#contributionTarget']:
+          thing.constructor[Symbol.for('Thing.referenceType')],
+
+        ['#contributionProperty']:
+          thingProperty,
+      }),
+    },
+  ],
+});
diff --git a/src/data/composite/things/contribution/withMatchingContributionPresets.js b/src/data/composite/things/contribution/withMatchingContributionPresets.js
new file mode 100644
index 00000000..09454164
--- /dev/null
+++ b/src/data/composite/things/contribution/withMatchingContributionPresets.js
@@ -0,0 +1,70 @@
+import {input, templateCompositeFrom} from '#composite';
+
+import {raiseOutputWithoutDependency} from '#composite/control-flow';
+import {withPropertyFromObject} from '#composite/data';
+
+import withContributionContext from './withContributionContext.js';
+
+export default templateCompositeFrom({
+  annotation: `withMatchingContributionPresets`,
+
+  outputs: ['#matchingContributionPresets'],
+
+  steps: () => [
+    withPropertyFromObject({
+      object: 'thing',
+      property: input.value('wikiInfo'),
+      internal: input.value(true),
+    }),
+
+    raiseOutputWithoutDependency({
+      dependency: '#thing.wikiInfo',
+      output: input.value({
+        '#matchingContributionPresets': null,
+      }),
+    }),
+
+    withPropertyFromObject({
+      object: '#thing.wikiInfo',
+      property: input.value('contributionPresets'),
+    }).outputs({
+      '#thing.wikiInfo.contributionPresets': '#contributionPresets',
+    }),
+
+    raiseOutputWithoutDependency({
+      dependency: '#contributionPresets',
+      mode: input.value('empty'),
+      output: input.value({
+        '#matchingContributionPresets': [],
+      }),
+    }),
+
+    withContributionContext(),
+
+    {
+      dependencies: [
+        '#contributionPresets',
+        '#contributionTarget',
+        '#contributionProperty',
+        'annotation',
+      ],
+
+      compute: (continuation, {
+        ['#contributionPresets']: presets,
+        ['#contributionTarget']: target,
+        ['#contributionProperty']: property,
+        ['annotation']: annotation,
+      }) => continuation({
+        ['#matchingContributionPresets']:
+          presets
+            .filter(preset =>
+              preset.context[0] === target &&
+              preset.context.slice(1).includes(property) &&
+              // For now, only match if the annotation is a complete match.
+              // Partial matches (e.g. because the contribution includes "two"
+              // annotations, separated by commas) don't count.
+              preset.annotation === annotation),
+      })
+    },
+  ],
+});
diff --git a/src/data/composite/things/track/index.js b/src/data/composite/things/track/index.js
index 8959de9f..714858a0 100644
--- a/src/data/composite/things/track/index.js
+++ b/src/data/composite/things/track/index.js
@@ -1,12 +1,16 @@
 export {default as exitWithoutUniqueCoverArt} from './exitWithoutUniqueCoverArt.js';
 export {default as inferredAdditionalNameList} from './inferredAdditionalNameList.js';
+export {default as inheritContributionListFromOriginalRelease} from './inheritContributionListFromOriginalRelease.js';
 export {default as inheritFromOriginalRelease} from './inheritFromOriginalRelease.js';
 export {default as sharedAdditionalNameList} from './sharedAdditionalNameList.js';
 export {default as trackReverseReferenceList} from './trackReverseReferenceList.js';
 export {default as withAlbum} from './withAlbum.js';
 export {default as withAlwaysReferenceByDirectory} from './withAlwaysReferenceByDirectory.js';
 export {default as withContainingTrackSection} from './withContainingTrackSection.js';
+export {default as withDate} from './withDate.js';
 export {default as withHasUniqueCoverArt} from './withHasUniqueCoverArt.js';
+export {default as withOriginalRelease} from './withOriginalRelease.js';
 export {default as withOtherReleases} from './withOtherReleases.js';
 export {default as withPropertyFromAlbum} from './withPropertyFromAlbum.js';
 export {default as withPropertyFromOriginalRelease} from './withPropertyFromOriginalRelease.js';
+export {default as withTrackArtDate} from './withTrackArtDate.js';
diff --git a/src/data/composite/things/track/inheritContributionListFromOriginalRelease.js b/src/data/composite/things/track/inheritContributionListFromOriginalRelease.js
new file mode 100644
index 00000000..f4ae3ddb
--- /dev/null
+++ b/src/data/composite/things/track/inheritContributionListFromOriginalRelease.js
@@ -0,0 +1,44 @@
+// Like inheritFromOriginalRelease, but tuned for contributions.
+// Recontextualized contributions for this track.
+
+import {input, templateCompositeFrom} from '#composite';
+
+import {exposeDependency, raiseOutputWithoutDependency}
+  from '#composite/control-flow';
+import {withRecontextualizedContributionList, withRedatedContributionList}
+  from '#composite/wiki-data';
+
+import withDate from './withDate.js';
+import withPropertyFromOriginalRelease
+  from './withPropertyFromOriginalRelease.js';
+
+export default templateCompositeFrom({
+  annotation: `inheritContributionListFromOriginalRelease`,
+
+  steps: () => [
+    withPropertyFromOriginalRelease({
+      property: input.thisProperty(),
+      notFoundValue: input.value([]),
+    }),
+
+    raiseOutputWithoutDependency({
+      dependency: '#isRerelease',
+      mode: input.value('falsy'),
+    }),
+
+    withRecontextualizedContributionList({
+      list: '#originalValue',
+    }),
+
+    withDate(),
+
+    withRedatedContributionList({
+      list: '#originalValue',
+      date: '#date',
+    }),
+
+    exposeDependency({
+      dependency: '#originalValue',
+    }),
+  ],
+});
diff --git a/src/data/composite/things/track/withContainingTrackSection.js b/src/data/composite/things/track/withContainingTrackSection.js
index eaac14de..2c42709b 100644
--- a/src/data/composite/things/track/withContainingTrackSection.js
+++ b/src/data/composite/things/track/withContainingTrackSection.js
@@ -30,7 +30,6 @@ export default templateCompositeFrom({
 
       compute: (continuation, {
         [input.myself()]: track,
-        [input('notFoundMode')]: notFoundMode,
         ['#album.trackSections']: trackSections,
       }) => continuation({
         ['#trackSection']:
diff --git a/src/data/composite/things/track/withDate.js b/src/data/composite/things/track/withDate.js
new file mode 100644
index 00000000..b5a770e9
--- /dev/null
+++ b/src/data/composite/things/track/withDate.js
@@ -0,0 +1,34 @@
+// Gets the track's own date. This is either its dateFirstReleased property
+// or, if unset, the album's date.
+
+import {input, templateCompositeFrom} from '#composite';
+
+import withPropertyFromAlbum from './withPropertyFromAlbum.js';
+
+export default templateCompositeFrom({
+  annotation: `withDate`,
+
+  outputs: ['#date'],
+
+  steps: () => [
+    {
+      dependencies: ['dateFirstReleased'],
+      compute: (continuation, {dateFirstReleased}) =>
+        (dateFirstReleased
+          ? continuation.raiseOutput({'#date': dateFirstReleased})
+          : continuation()),
+    },
+
+    withPropertyFromAlbum({
+      property: input.value('date'),
+    }),
+
+    {
+      dependencies: ['#album.date'],
+      compute: (continuation, {['#album.date']: albumDate}) =>
+        (albumDate
+          ? continuation.raiseOutput({'#date': albumDate})
+          : continuation.raiseOutput({'#date': null})),
+    },
+  ],
+})
diff --git a/src/data/composite/things/track/withHasUniqueCoverArt.js b/src/data/composite/things/track/withHasUniqueCoverArt.js
index 96078d5f..f7e65f25 100644
--- a/src/data/composite/things/track/withHasUniqueCoverArt.js
+++ b/src/data/composite/things/track/withHasUniqueCoverArt.js
@@ -29,7 +29,10 @@ export default templateCompositeFrom({
           : continuation()),
     },
 
-    withResolvedContribs({from: 'coverArtistContribs'}),
+    withResolvedContribs({
+      from: 'coverArtistContribs',
+      date: input.value(null),
+    }),
 
     {
       dependencies: ['#resolvedContribs'],
diff --git a/src/data/composite/things/track/withTrackArtDate.js b/src/data/composite/things/track/withTrackArtDate.js
new file mode 100644
index 00000000..e2c4d8bc
--- /dev/null
+++ b/src/data/composite/things/track/withTrackArtDate.js
@@ -0,0 +1,80 @@
+// Gets the date of cover art release. This represents only the track's own
+// unique cover artwork, if any.
+//
+// If the 'fallback' option is false (the default), this will only output
+// the track's own coverArtDate or its album's trackArtDate. If 'fallback'
+// is set, and neither of these is available, it'll output the track's own
+// date instead.
+
+import {input, templateCompositeFrom} from '#composite';
+import {isDate} from '#validators';
+
+import {raiseOutputWithoutDependency} from '#composite/control-flow';
+
+import withDate from './withDate.js';
+import withHasUniqueCoverArt from './withHasUniqueCoverArt.js';
+import withPropertyFromAlbum from './withPropertyFromAlbum.js';
+
+export default templateCompositeFrom({
+  annotation: `withTrackArtDate`,
+
+  inputs: {
+    from: input({
+      validate: isDate,
+      defaultDependency: 'coverArtDate',
+      acceptsNull: true,
+    }),
+
+    fallback: input({
+      type: 'boolean',
+      defaultValue: false,
+    }),
+  },
+
+  outputs: ['#trackArtDate'],
+
+  steps: () => [
+    withHasUniqueCoverArt(),
+
+    raiseOutputWithoutDependency({
+      dependency: '#hasUniqueCoverArt',
+      mode: input.value('falsy'),
+      output: input.value({'#trackArtDate': null}),
+    }),
+
+    {
+      dependencies: [input('from')],
+      compute: (continuation, {
+        [input('from')]: from,
+      }) =>
+        (from
+          ? continuation.raiseOutput({'#trackArtDate': from})
+          : continuation()),
+    },
+
+    withPropertyFromAlbum({
+      property: input.value('trackArtDate'),
+    }),
+
+    {
+      dependencies: [
+        '#album.trackArtDate',
+        input('fallback'),
+      ],
+
+      compute: (continuation, {
+        ['#album.trackArtDate']: albumTrackArtDate,
+        [input('fallback')]: fallback,
+      }) =>
+        (albumTrackArtDate
+          ? continuation.raiseOutput({'#trackArtDate': albumTrackArtDate})
+       : fallback
+          ? continuation()
+          : continuation.raiseOutput({'#trackArtDate': null})),
+    },
+
+    withDate().outputs({
+      '#date': '#trackArtDate',
+    }),
+  ],
+});
diff --git a/src/data/composite/wiki-data/exitWithoutContribs.js b/src/data/composite/wiki-data/exitWithoutContribs.js
index 2c8219fc..cf52950d 100644
--- a/src/data/composite/wiki-data/exitWithoutContribs.js
+++ b/src/data/composite/wiki-data/exitWithoutContribs.js
@@ -24,6 +24,7 @@ export default templateCompositeFrom({
   steps: () => [
     withResolvedContribs({
       from: input('contribs'),
+      date: input.value(null),
     }),
 
     // TODO: Fairly certain exitWithoutDependency would be sufficient here.
diff --git a/src/data/composite/wiki-data/index.js b/src/data/composite/wiki-data/index.js
index 15ebaffa..5f17ca3a 100644
--- a/src/data/composite/wiki-data/index.js
+++ b/src/data/composite/wiki-data/index.js
@@ -6,9 +6,14 @@
 
 export {default as exitWithoutContribs} from './exitWithoutContribs.js';
 export {default as inputWikiData} from './inputWikiData.js';
+export {default as withClonedThings} from './withClonedThings.js';
+export {default as withContributionListSums} from './withContributionListSums.js';
+export {default as withCoverArtDate} from './withCoverArtDate.js';
 export {default as withDirectory} from './withDirectory.js';
 export {default as withDirectoryFromName} from './withDirectoryFromName.js';
 export {default as withParsedCommentaryEntries} from './withParsedCommentaryEntries.js';
+export {default as withRecontextualizedContributionList} from './withRecontextualizedContributionList.js';
+export {default as withRedatedContributionList} from './withRedatedContributionList.js';
 export {default as withResolvedContribs} from './withResolvedContribs.js';
 export {default as withResolvedReference} from './withResolvedReference.js';
 export {default as withResolvedReferenceList} from './withResolvedReferenceList.js';
diff --git a/src/data/composite/wiki-data/withClonedThings.js b/src/data/composite/wiki-data/withClonedThings.js
new file mode 100644
index 00000000..9af6aa84
--- /dev/null
+++ b/src/data/composite/wiki-data/withClonedThings.js
@@ -0,0 +1,68 @@
+// Clones all the things in a list. If the 'assign' input is provided,
+// all new things are assigned the same specified properties. If the
+// 'assignEach' input is provided, each new thing is assigned the
+// corresponding properties.
+
+import CacheableObject from '#cacheable-object';
+import {input, templateCompositeFrom} from '#composite';
+import {isObject, sparseArrayOf} from '#validators';
+
+import {withMappedList} from '#composite/data';
+
+export default templateCompositeFrom({
+  annotation: `withClonedThings`,
+
+  inputs: {
+    things: input({type: 'array'}),
+
+    assign: input({
+      type: 'object',
+      defaultValue: null,
+    }),
+
+    assignEach: input({
+      validate: sparseArrayOf(isObject),
+      defaultValue: null,
+    }),
+  },
+
+  outputs: ['#clonedThings'],
+
+  steps: () => [
+    {
+      dependencies: [input('assign'), input('assignEach')],
+      compute: (continuation, {
+        [input('assign')]: assign,
+        [input('assignEach')]: assignEach,
+      }) => continuation({
+        ['#assignmentMap']:
+          (index) =>
+            (assign && assignEach
+              ? {...assignEach[index] ?? {}, ...assign}
+           : assignEach
+              ? assignEach[index] ?? {}
+              : assign ?? {}),
+      }),
+    },
+
+    {
+      dependencies: ['#assignmentMap'],
+      compute: (continuation, {
+        ['#assignmentMap']: assignmentMap,
+      }) => continuation({
+        ['#cloningMap']:
+          (thing, index) =>
+            Object.assign(
+              CacheableObject.clone(thing),
+              assignmentMap(index)),
+      }),
+    },
+
+    withMappedList({
+      list: input('things'),
+      map: '#cloningMap',
+    }).outputs({
+      '#mappedList': '#clonedThings',
+    }),
+  ],
+});
diff --git a/src/data/composite/wiki-data/withContributionListSums.js b/src/data/composite/wiki-data/withContributionListSums.js
new file mode 100644
index 00000000..b4f36361
--- /dev/null
+++ b/src/data/composite/wiki-data/withContributionListSums.js
@@ -0,0 +1,95 @@
+// Gets the total duration and contribution count from a list of contributions,
+// respecting their `countInContributionTotals` and `countInDurationTotals`
+// flags.
+
+import {input, templateCompositeFrom} from '#composite';
+
+import {
+  withFilteredList,
+  withPropertiesFromList,
+  withPropertyFromList,
+  withSum,
+  withUniqueItemsOnly,
+} from '#composite/data';
+
+export default templateCompositeFrom({
+  annotation: `withContributionListSums`,
+
+  inputs: {
+    list: input({type: 'array'}),
+  },
+
+  outputs: [
+    '#contributionListCount',
+    '#contributionListDuration',
+  ],
+
+  steps: () => [
+    withPropertiesFromList({
+      list: input('list'),
+      properties: input.value([
+        'countInContributionTotals',
+        'countInDurationTotals',
+      ]),
+    }),
+
+    withFilteredList({
+      list: input('list'),
+      filter: '#list.countInContributionTotals',
+    }).outputs({
+      '#filteredList': '#contributionsForCounting',
+    }),
+
+    withFilteredList({
+      list: input('list'),
+      filter: '#list.countInDurationTotals',
+    }).outputs({
+      '#filteredList': '#contributionsForDuration',
+    }),
+
+    {
+      dependencies: ['#contributionsForCounting'],
+      compute: (continuation, {
+        ['#contributionsForCounting']: contributionsForCounting,
+      }) => continuation({
+        ['#count']:
+          contributionsForCounting.length,
+      }),
+    },
+
+    withPropertyFromList({
+      list: '#contributionsForDuration',
+      property: input.value('thing'),
+    }),
+
+    // Don't double-up the durations for a track where the artist has multiple
+    // contributions.
+    withUniqueItemsOnly({
+      list: '#contributionsForDuration.thing',
+    }),
+
+    withPropertyFromList({
+      list: '#contributionsForDuration.thing',
+      property: input.value('duration'),
+    }).outputs({
+      '#contributionsForDuration.thing.duration': '#durationValues',
+    }),
+
+    withSum({
+      values: '#durationValues',
+    }).outputs({
+      '#sum': '#duration',
+    }),
+
+    {
+      dependencies: ['#count', '#duration'],
+      compute: (continuation, {
+        ['#count']: count,
+        ['#duration']: duration,
+      }) => continuation({
+        ['#contributionListCount']: count,
+        ['#contributionListDuration']: duration,
+      }),
+    },
+  ],
+});
diff --git a/src/data/composite/wiki-data/withCoverArtDate.js b/src/data/composite/wiki-data/withCoverArtDate.js
new file mode 100644
index 00000000..0c644c77
--- /dev/null
+++ b/src/data/composite/wiki-data/withCoverArtDate.js
@@ -0,0 +1,70 @@
+// Gets the current thing's coverArtDate, or, if the 'fallback' option is set,
+// the thing's date. This is always null if the thing doesn't actually have
+// any coverArtistContribs.
+
+import {input, templateCompositeFrom} from '#composite';
+import {isDate} from '#validators';
+
+import {raiseOutputWithoutDependency} from '#composite/control-flow';
+
+import withResolvedContribs from './withResolvedContribs.js';
+
+export default templateCompositeFrom({
+  annotation: `withCoverArtDate`,
+
+  inputs: {
+    from: input({
+      validate: isDate,
+      defaultDependency: 'coverArtDate',
+      acceptsNull: true,
+    }),
+
+    fallback: input({
+      type: 'boolean',
+      defaultValue: false,
+    }),
+  },
+
+  outputs: ['#coverArtDate'],
+
+  steps: () => [
+    withResolvedContribs({
+      from: 'coverArtistContribs',
+      date: input.value(null),
+    }),
+
+    raiseOutputWithoutDependency({
+      dependency: '#resolvedContribs',
+      mode: input.value('empty'),
+      output: input.value({'#coverArtDate': null}),
+    }),
+
+    {
+      dependencies: [input('from')],
+      compute: (continuation, {
+        [input('from')]: from,
+      }) =>
+        (from
+          ? continuation.raiseOutput({'#coverArtDate': from})
+          : continuation()),
+    },
+
+    {
+      dependencies: [input('fallback')],
+      compute: (continuation, {
+        [input('fallback')]: fallback,
+      }) =>
+        (fallback
+          ? continuation()
+          : continuation.raiseOutput({'#coverArtDate': null})),
+    },
+
+    {
+      dependencies: ['date'],
+      compute: (continuation, {date}) =>
+        (date
+          ? continuation.raiseOutput({'#coverArtDate': date})
+          : continuation.raiseOutput({'#coverArtDate': null})),
+    },
+  ],
+});
diff --git a/src/data/composite/wiki-data/withRecontextualizedContributionList.js b/src/data/composite/wiki-data/withRecontextualizedContributionList.js
new file mode 100644
index 00000000..d2401eac
--- /dev/null
+++ b/src/data/composite/wiki-data/withRecontextualizedContributionList.js
@@ -0,0 +1,101 @@
+// Clones all the contributions in a list, with thing and thingProperty both
+// updated to match the current thing. Overwrites the provided dependency.
+// Optionally updates artistProperty as well. Doesn't do anything if
+// the provided dependency is null.
+//
+// See also:
+//  - withRedatedContributionList
+//
+
+import {input, templateCompositeFrom} from '#composite';
+import {isStringNonEmpty} from '#validators';
+
+import {raiseOutputWithoutDependency} from '#composite/control-flow';
+import {withClonedThings} from '#composite/wiki-data';
+
+export default templateCompositeFrom({
+  annotation: `withRecontextualizedContributionList`,
+
+  inputs: {
+    list: input.staticDependency({
+      type: 'array',
+      acceptsNull: true,
+    }),
+
+    artistProperty: input({
+      validate: isStringNonEmpty,
+      defaultValue: null,
+    }),
+  },
+
+  outputs: ({
+    [input.staticDependency('list')]: list,
+  }) => [list],
+
+  steps: () => [
+    // TODO: Is raiseOutputWithoutDependency workable here?
+    // Is it true that not specifying any output wouldn't overwrite
+    // the provided dependency?
+    {
+      dependencies: [
+        input.staticDependency('list'),
+        input('list'),
+      ],
+
+      compute: (continuation, {
+        [input.staticDependency('list')]: dependency,
+        [input('list')]: list,
+      }) =>
+        (list
+          ? continuation()
+          : continuation.raiseOutput({
+              [dependency]: list,
+            })),
+    },
+
+    {
+      dependencies: [
+        input.myself(),
+        input.thisProperty(),
+        input('artistProperty'),
+      ],
+
+      compute: (continuation, {
+        [input.myself()]: myself,
+        [input.thisProperty()]: thisProperty,
+        [input('artistProperty')]: artistProperty,
+      }) => continuation({
+        ['#assignment']:
+          Object.assign(
+            {thing: myself},
+            {thingProperty: thisProperty},
+
+            (artistProperty
+              ? {artistProperty}
+              : {})),
+      }),
+    },
+
+    withClonedThings({
+      things: input('list'),
+      assign: '#assignment',
+    }).outputs({
+      '#clonedThings': '#newContributions',
+    }),
+
+    {
+      dependencies: [
+        input.staticDependency('list'),
+        '#newContributions',
+      ],
+
+      compute: (continuation, {
+        [input.staticDependency('list')]: listDependency,
+        ['#newContributions']: newContributions,
+      }) => continuation({
+        [listDependency]:
+          newContributions,
+      }),
+    },
+  ],
+});
diff --git a/src/data/composite/wiki-data/withRedatedContributionList.js b/src/data/composite/wiki-data/withRedatedContributionList.js
new file mode 100644
index 00000000..12f3e16b
--- /dev/null
+++ b/src/data/composite/wiki-data/withRedatedContributionList.js
@@ -0,0 +1,127 @@
+// Clones all the contributions in a list, with date updated to the provided
+// value. Overwrites the provided dependency. Doesn't do anything if the
+// provided dependency is null, or the provided date is null.
+//
+// If 'override' is true (the default), then so long as the provided date has
+// a value at all, it's always written onto the (cloned) contributions.
+//
+// If 'override' is false, and any of the contributions were already dated,
+// those will keep their existing dates.
+//
+// See also:
+//  - withRecontextualizedContributionList
+//
+
+import {input, templateCompositeFrom} from '#composite';
+import {isDate} from '#validators';
+
+import {withMappedList, withPropertyFromList} from '#composite/data';
+import {withClonedThings} from '#composite/wiki-data';
+
+export default templateCompositeFrom({
+  annotation: `withRedatedContributionList`,
+
+  inputs: {
+    list: input.staticDependency({
+      type: 'array',
+      acceptsNull: true,
+    }),
+
+    date: input({
+      validate: isDate,
+      acceptsNull: true,
+    }),
+
+    override: input({
+      type: 'boolean',
+      defaultValue: true,
+    }),
+  },
+
+  outputs: ({
+    [input.staticDependency('list')]: list,
+  }) => [list],
+
+  steps: () => [
+    // TODO: Is raiseOutputWithoutDependency workable here?
+    // Is it true that not specifying any output wouldn't overwrite
+    // the provided dependency?
+    {
+      dependencies: [
+        input.staticDependency('list'),
+        input('list'),
+        input('date'),
+      ],
+
+      compute: (continuation, {
+        [input.staticDependency('list')]: dependency,
+        [input('list')]: list,
+        [input('date')]: date,
+      }) =>
+        (list && date
+          ? continuation()
+          : continuation.raiseOutput({
+              [dependency]: list,
+            })),
+    },
+
+    withPropertyFromList({
+      list: input('list'),
+      property: input.value('date'),
+    }).outputs({
+      '#list.date': '#existingDates',
+    }),
+
+    {
+      dependencies: [
+        input('date'),
+        input('override'),
+        '#existingDates',
+      ],
+
+      compute: (continuation, {
+        [input('date')]: date,
+        [input('override')]: override,
+        '#existingDates': existingDates,
+      }) => continuation({
+        ['#assignmentMap']:
+          // TODO: Should be mapping over withIndicesFromList
+          (_, index) =>
+            (!override && existingDates[index]
+              ? {date: existingDates[index]}
+           : date
+              ? {date}
+              : {}),
+      }),
+    },
+
+    withMappedList({
+      list: input('list'),
+      map: '#assignmentMap',
+    }).outputs({
+      '#mappedList': '#assignment',
+    }),
+
+    withClonedThings({
+      things: input('list'),
+      assignEach: '#assignment',
+    }).outputs({
+      '#clonedThings': '#newContributions',
+    }),
+
+    {
+      dependencies: [
+        input.staticDependency('list'),
+        '#newContributions',
+      ],
+
+      compute: (continuation, {
+        [input.staticDependency('list')]: listDependency,
+        ['#newContributions']: newContributions,
+      }) => continuation({
+        [listDependency]:
+          newContributions,
+      }),
+    },
+  ],
+});
diff --git a/src/data/composite/wiki-data/withResolvedContribs.js b/src/data/composite/wiki-data/withResolvedContribs.js
index 95266382..b5d7255b 100644
--- a/src/data/composite/wiki-data/withResolvedContribs.js
+++ b/src/data/composite/wiki-data/withResolvedContribs.js
@@ -7,17 +7,11 @@
 import {input, templateCompositeFrom} from '#composite';
 import find from '#find';
 import {filterMultipleArrays, stitchArrays} from '#sugar';
-import {is, isContributionList} from '#validators';
+import thingConstructors from '#things';
+import {is, isContributionList, isDate, isStringNonEmpty} from '#validators';
 
-import {
-  raiseOutputWithoutDependency,
-} from '#composite/control-flow';
-
-import {
-  withPropertiesFromList,
-} from '#composite/data';
-
-import withResolvedReferenceList from './withResolvedReferenceList.js';
+import {raiseOutputWithoutDependency} from '#composite/control-flow';
+import {withPropertiesFromList} from '#composite/data';
 
 export default templateCompositeFrom({
   annotation: `withResolvedContribs`,
@@ -28,10 +22,25 @@ export default templateCompositeFrom({
       acceptsNull: true,
     }),
 
+    date: input({
+      validate: isDate,
+      acceptsNull: true,
+    }),
+
     notFoundMode: input({
       validate: is('exit', 'filter', 'null'),
       defaultValue: 'null',
     }),
+
+    thingProperty: input({
+      validate: isStringNonEmpty,
+      defaultValue: null,
+    }),
+
+    artistProperty: input({
+      validate: isStringNonEmpty,
+      defaultValue: null,
+    }),
   },
 
   outputs: ['#resolvedContribs'],
@@ -45,34 +54,96 @@ export default templateCompositeFrom({
       }),
     }),
 
+    {
+      dependencies: [
+        input('thingProperty'),
+        input.staticDependency('from'),
+      ],
+
+      compute: (continuation, {
+        [input('thingProperty')]: thingProperty,
+        [input.staticDependency('from')]: fromDependency,
+      }) => continuation({
+        ['#thingProperty']:
+          (thingProperty
+            ? thingProperty
+         : !fromDependency?.startsWith('#')
+            ? fromDependency
+            : null),
+      }),
+    },
+
     withPropertiesFromList({
       list: input('from'),
       properties: input.value(['artist', 'annotation']),
       prefix: input.value('#contribs'),
     }),
 
-    withResolvedReferenceList({
-      list: '#contribs.artist',
-      data: 'artistData',
-      find: input.value(find.artist),
-      notFoundMode: input('notFoundMode'),
-    }).outputs({
-      ['#resolvedReferenceList']: '#contribs.artist',
-    }),
-
     {
-      dependencies: ['#contribs.artist', '#contribs.annotation'],
+      dependencies: [
+        '#contribs.artist',
+        '#contribs.annotation',
+        input('date'),
+      ],
 
       compute(continuation, {
         ['#contribs.artist']: artist,
         ['#contribs.annotation']: annotation,
+        [input('date')]: date,
       }) {
         filterMultipleArrays(artist, annotation, (artist, _annotation) => artist);
+
         return continuation({
-          ['#resolvedContribs']:
-            stitchArrays({artist, annotation}),
+          ['#details']:
+            stitchArrays({artist, annotation})
+              .map(details => ({
+                ...details,
+                date: date ?? null,
+              })),
         });
       },
     },
+
+    {
+      dependencies: [
+        '#details',
+        '#thingProperty',
+        input('artistProperty'),
+        input.myself(),
+      ],
+
+      compute: (continuation, {
+        ['#details']: details,
+        ['#thingProperty']: thingProperty,
+        [input('artistProperty')]: artistProperty,
+        [input.myself()]: myself,
+      }) => continuation({
+        ['#contributions']:
+          details.map(details => {
+            const contrib = new thingConstructors.Contribution();
+
+            Object.assign(contrib, {
+              ...details,
+              thing: myself,
+              thingProperty: thingProperty,
+              artistProperty: artistProperty,
+            });
+
+            return contrib;
+          }),
+      }),
+    },
+
+    {
+      dependencies: ['#contributions'],
+
+      compute: (continuation, {
+        ['#contributions']: contributions,
+      }) => continuation({
+        ['#resolvedContribs']:
+          contributions
+            .filter(contrib => contrib.artist),
+      }),
+    },
   ],
 });
diff --git a/src/data/composite/wiki-data/withReverseContributionList.js b/src/data/composite/wiki-data/withReverseContributionList.js
index 91e125e4..63e712bb 100644
--- a/src/data/composite/wiki-data/withReverseContributionList.js
+++ b/src/data/composite/wiki-data/withReverseContributionList.js
@@ -1,6 +1,6 @@
 // Analogous implementation for withReverseReferenceList, for contributions.
-// This is all duplicate code and both should be ported to the same underlying
-// data form later on.
+// This is mostly duplicate code and both should be ported to the same
+// underlying data form later on.
 //
 // This implementation uses a global cache (via WeakMap) to attempt to speed
 // up subsequent similar accesses.
@@ -10,9 +10,11 @@
 // is used, a fresh cache will always be created.
 
 import {input, templateCompositeFrom} from '#composite';
+import {stitchArrays} from '#sugar';
 
 import {exitWithoutDependency, raiseOutputWithoutDependency}
   from '#composite/control-flow';
+import {withFlattenedList, withMappedList} from '#composite/data';
 
 import inputWikiData from './inputWikiData.js';
 
@@ -33,6 +35,8 @@ export default templateCompositeFrom({
   outputs: ['#reverseContributionList'],
 
   steps: () => [
+    // Common behavior --
+
     // Early exit with an empty array if the data list isn't available.
     exitWithoutDependency({
       dependency: input('data'),
@@ -46,46 +50,122 @@ export default templateCompositeFrom({
       output: input.value({'#reverseContributionList': []}),
     }),
 
+    // Check for an existing cache record which corresponds to this
+    // input('list') and input('data'). If it exists, query it for the
+    // current thing, and raise that; if it doesn't, create it, put it
+    // where it needs to be, and provide it so the next steps can fill
+    // it in.
     {
-      dependencies: [input.myself(), input('data'), input('list')],
+      dependencies: [input('list'), input('data'), input.myself()],
 
       compute: (continuation, {
-        [input.myself()]: myself,
-        [input('data')]: data,
         [input('list')]: list,
+        [input('data')]: data,
+        [input.myself()]: myself,
       }) => {
         if (!caches.has(list)) {
-          caches.set(list, new WeakMap());
+          const cache = new WeakMap();
+          caches.set(list, cache);
+
+          const cacheRecord = new WeakMap();
+          cache.set(data, cacheRecord);
+
+          return continuation({
+            ['#cacheRecord']: cacheRecord,
+          });
         }
 
         const cache = caches.get(list);
 
         if (!cache.has(data)) {
           const cacheRecord = new WeakMap();
+          cache.set(data, cacheRecord);
+
+          return continuation({
+            ['#cacheRecord']: cacheRecord,
+          });
+        }
+
+        return continuation.raiseOutput({
+          ['#reverseContributionList']:
+            cache.get(data).get(myself) ?? [],
+        });
+      },
+    },
+
+    // Unique behavior for contribution lists --
+
+    {
+      dependencies: [input('list')],
+      compute: (continuation, {
+        [input('list')]: list,
+      }) => continuation({
+        ['#contributionListMap']:
+          thing => thing[list],
+      }),
+    },
+
+    withMappedList({
+      list: input('data'),
+      map: '#contributionListMap',
+    }).outputs({
+      '#mappedList': '#contributionLists',
+    }),
 
-          for (const referencingThing of data) {
-            const referenceList = referencingThing[list];
+    withFlattenedList({
+      list: '#contributionLists',
+    }).outputs({
+      '#flattenedList': '#referencingThings',
+    }),
 
-            // Destructuring {artist} is the only unique part of the
-            // withReverseContributionList implementation, compared to
-            // withReverseReferneceList.
-            for (const {artist: referencedThing} of referenceList) {
+    withMappedList({
+      list: '#referencingThings',
+      map: input.value(contrib => [contrib.artist]),
+    }).outputs({
+      '#mappedList': '#referencedThings',
+    }),
+
+    // Common behavior --
+
+    // Actually fill in the cache record. Since we're building up a *reverse*
+    // reference list, track connections in terms of the referenced thing.
+    // No newly-provided dependencies here since we're mutating the cache
+    // record, which is properly in store and will probably be reused in the
+    // future (and certainly in the next step).
+    {
+      dependencies: ['#cacheRecord', '#referencingThings', '#referencedThings'],
+      compute: (continuation, {
+        ['#cacheRecord']: cacheRecord,
+        ['#referencingThings']: referencingThings,
+        ['#referencedThings']: referencedThings,
+      }) => {
+        stitchArrays({
+          referencingThing: referencingThings,
+          referencedThings: referencedThings,
+        }).forEach(({referencingThing, referencedThings}) => {
+            for (const referencedThing of referencedThings) {
               if (cacheRecord.has(referencedThing)) {
                 cacheRecord.get(referencedThing).push(referencingThing);
               } else {
                 cacheRecord.set(referencedThing, [referencingThing]);
               }
             }
-          }
+          });
 
-          cache.set(data, cacheRecord);
-        }
-
-        return continuation({
-          ['#reverseContributionList']:
-            cache.get(data).get(myself) ?? [],
-        });
+        return continuation();
       },
     },
+
+    // Then just pluck out the current object from the now-filled cache record!
+    {
+      dependencies: ['#cacheRecord', input.myself()],
+      compute: (continuation, {
+        ['#cacheRecord']: cacheRecord,
+        [input.myself()]: myself,
+      }) => continuation({
+        ['#reverseContributionList']:
+          cacheRecord.get(myself) ?? [],
+      }),
+    },
   ],
 });
diff --git a/src/data/composite/wiki-data/withReverseReferenceList.js b/src/data/composite/wiki-data/withReverseReferenceList.js
index 8cd540a5..1f8c082f 100644
--- a/src/data/composite/wiki-data/withReverseReferenceList.js
+++ b/src/data/composite/wiki-data/withReverseReferenceList.js
@@ -12,9 +12,11 @@
 // so any changes should be reflected there (until these are combined).
 
 import {input, templateCompositeFrom} from '#composite';
+import {stitchArrays} from '#sugar';
 
 import {exitWithoutDependency, raiseOutputWithoutDependency}
   from '#composite/control-flow';
+import {withMappedList} from '#composite/data';
 
 import inputWikiData from './inputWikiData.js';
 
@@ -35,6 +37,8 @@ export default templateCompositeFrom({
   outputs: ['#reverseReferenceList'],
 
   steps: () => [
+    // Common behavior --
+
     // Early exit with an empty array if the data list isn't available.
     exitWithoutDependency({
       dependency: input('data'),
@@ -48,42 +52,119 @@ export default templateCompositeFrom({
       output: input.value({'#reverseReferenceList': []}),
     }),
 
+    // Check for an existing cache record which corresponds to this
+    // input('list') and input('data'). If it exists, query it for the
+    // current thing, and raise that; if it doesn't, create it, put it
+    // where it needs to be, and provide it so the next steps can fill
+    // it in.
     {
-      dependencies: [input.myself(), input('data'), input('list')],
+      dependencies: [input('list'), input('data'), input.myself()],
 
       compute: (continuation, {
-        [input.myself()]: myself,
-        [input('data')]: data,
         [input('list')]: list,
+        [input('data')]: data,
+        [input.myself()]: myself,
       }) => {
         if (!caches.has(list)) {
-          caches.set(list, new WeakMap());
+          const cache = new WeakMap();
+          caches.set(list, cache);
+
+          const cacheRecord = new WeakMap();
+          cache.set(data, cacheRecord);
+
+          return continuation({
+            ['#cacheRecord']: cacheRecord,
+          });
         }
 
         const cache = caches.get(list);
 
         if (!cache.has(data)) {
           const cacheRecord = new WeakMap();
+          cache.set(data, cacheRecord);
+
+          return continuation({
+            ['#cacheRecord']: cacheRecord,
+          });
+        }
+
+        return continuation.raiseOutput({
+          ['#reverseReferenceList']:
+            cache.get(data).get(myself) ?? [],
+        });
+      },
+    },
+
+    // Unique behavior for reference lists --
+
+    {
+      dependencies: [input('list')],
+      compute: (continuation, {
+        [input('list')]: list,
+      }) => continuation({
+        ['#referenceMap']:
+          thing => thing[list],
+      }),
+    },
+
+    withMappedList({
+      list: input('data'),
+      map: '#referenceMap',
+    }).outputs({
+      '#mappedList': '#referencedThings',
+    }),
+
+    {
+      dependencies: [input('data')],
+      compute: (continuation, {
+        [input('data')]: data,
+      }) => continuation({
+        ['#referencingThings']:
+          data,
+      }),
+    },
+
+    // Common behavior --
 
-          for (const referencingThing of data) {
-            const referenceList = referencingThing[list];
-            for (const referencedThing of referenceList) {
+    // Actually fill in the cache record. Since we're building up a *reverse*
+    // reference list, track connections in terms of the referenced thing.
+    // No newly-provided dependencies here since we're mutating the cache
+    // record, which is properly in store and will probably be reused in the
+    // future (and certainly in the next step).
+    {
+      dependencies: ['#cacheRecord', '#referencingThings', '#referencedThings'],
+      compute: (continuation, {
+        ['#cacheRecord']: cacheRecord,
+        ['#referencingThings']: referencingThings,
+        ['#referencedThings']: referencedThings,
+      }) => {
+        stitchArrays({
+          referencingThing: referencingThings,
+          referencedThings: referencedThings,
+        }).forEach(({referencingThing, referencedThings}) => {
+            for (const referencedThing of referencedThings) {
               if (cacheRecord.has(referencedThing)) {
                 cacheRecord.get(referencedThing).push(referencingThing);
               } else {
                 cacheRecord.set(referencedThing, [referencingThing]);
               }
             }
-          }
+          });
 
-          cache.set(data, cacheRecord);
-        }
-
-        return continuation({
-          ['#reverseReferenceList']:
-            cache.get(data).get(myself) ?? [],
-        });
+        return continuation();
       },
     },
+
+    // Then just pluck out the current object from the now-filled cache record!
+    {
+      dependencies: ['#cacheRecord', input.myself()],
+      compute: (continuation, {
+        ['#cacheRecord']: cacheRecord,
+        [input.myself()]: myself,
+      }) => continuation({
+        ['#reverseReferenceList']:
+          cacheRecord.get(myself) ?? [],
+      }),
+    },
   ],
 });
diff --git a/src/data/composite/wiki-properties/contributionList.js b/src/data/composite/wiki-properties/contributionList.js
index aad12a2d..d9a6b417 100644
--- a/src/data/composite/wiki-properties/contributionList.js
+++ b/src/data/composite/wiki-properties/contributionList.js
@@ -15,7 +15,7 @@
 //
 
 import {input, templateCompositeFrom} from '#composite';
-import {isContributionList} from '#validators';
+import {isContributionList, isDate, isStringNonEmpty} from '#validators';
 
 import {exposeConstant, exposeDependencyOrContinue} from '#composite/control-flow';
 import {withResolvedContribs} from '#composite/wiki-data';
@@ -25,11 +25,34 @@ export default templateCompositeFrom({
 
   compose: false,
 
+  inputs: {
+    date: input({
+      validate: isDate,
+      acceptsNull: true,
+    }),
+
+    artistProperty: input({
+      validate: isStringNonEmpty,
+      defaultValue: null,
+    }),
+  },
+
   update: {validate: isContributionList},
 
   steps: () => [
-    withResolvedContribs({from: input.updateValue()}),
-    exposeDependencyOrContinue({dependency: '#resolvedContribs'}),
-    exposeConstant({value: input.value([])}),
+    withResolvedContribs({
+      from: input.updateValue(),
+      thingProperty: input.thisProperty(),
+      artistProperty: input('artistProperty'),
+      date: input('date'),
+    }),
+
+    exposeDependencyOrContinue({
+      dependency: '#resolvedContribs',
+    }),
+
+    exposeConstant({
+      value: input.value([]),
+    }),
   ],
 });
diff --git a/src/data/composite/wiki-properties/index.js b/src/data/composite/wiki-properties/index.js
index 89cb6838..5328d17e 100644
--- a/src/data/composite/wiki-properties/index.js
+++ b/src/data/composite/wiki-properties/index.js
@@ -24,5 +24,6 @@ export {default as reverseReferenceList} from './reverseReferenceList.js';
 export {default as simpleDate} from './simpleDate.js';
 export {default as simpleString} from './simpleString.js';
 export {default as singleReference} from './singleReference.js';
+export {default as thing} from './thing.js';
 export {default as urls} from './urls.js';
 export {default as wikiData} from './wikiData.js';
diff --git a/src/data/composite/wiki-properties/thing.js b/src/data/composite/wiki-properties/thing.js
new file mode 100644
index 00000000..5b5d77dd
--- /dev/null
+++ b/src/data/composite/wiki-properties/thing.js
@@ -0,0 +1,31 @@
+// An individual Thing, provided directly rather than by reference.
+
+import {input, templateCompositeFrom} from '#composite';
+import {isThingClass, validateThing} from '#validators';
+
+export default templateCompositeFrom({
+  annotation: `wikiData`,
+
+  compose: false,
+
+  inputs: {
+    class: input.staticValue({
+      validate: isThingClass,
+      defaultValue: null,
+    }),
+  },
+
+  update: ({
+    [input.staticValue('class')]: thingClass,
+  }) => ({
+    validate:
+      validateThing({
+        referenceType:
+          (thingClass
+            ? thingClass[Symbol.for('Thing.referenceType')]
+            : ''),
+      }),
+  }),
+
+  steps: () => [],
+});