Allow using similarity_measure at the set level.

CHANGELOG.md

@@ -4,6 +4,7 @@
 
 - Add `composed entity expression` as a new value in the `EntityType` enumeration ([issue](https://github.com/mapping-commons/sssom/issues/402)).
 - Add `predicate_type` slot (previously defined but unused) to the `Mapping` and `MappingSet` classes ([issue](https://github.com/mapping-commons/sssom/issues/404)).
+- Add `similarity_measure` slot to the `MappingSet` class ([issue](https://github.com/mapping-commons/sssom/issues/411)).
 - TBD
 
 ## SSSOM version 1.0.0

src/docs/spec-model.md

@@ -57,7 +57,8 @@ For convenience, here is the current list of propagatable slots:
 * `subject_source`,
 * `subject_source_version`,
 * `subject_type`,
-* `predicate_type`.
+* `predicate_type`,
+* `similarity_measure`.
 
 When a mapping set object has a value in one of its propagatable slots, this MUST be interpreted as if all mappings within the set had that same value in their corresponding slot. For example, if a set has the value _foo_ in its `mapping_tool` slot, all the mappings in that set MUST be treated as if they had the value _foo_ in their `mapping_tool` slot.
 

src/sssom_schema/schema/sssom_schema.yaml

@@ -643,6 +643,8 @@ slots:
       To make processing this field as unambiguous as possible, we recommend using 
       wikidata CURIEs, but the type of this field is deliberately unspecified.
     range: string
+    annotations:
+      propagated: true
     examples:
       - value: https://www.wikidata.org/entity/Q865360
         description: the Wikidata IRI for the Jaccard index measure).
@@ -740,6 +742,7 @@ classes:
     - object_match_field
     - subject_preprocessing
     - object_preprocessing
+    - similarity_measure
     - see_also
     - issue_tracker
     - other