Merge pull request #20 from mapping-commons/mapping-cardinality

Add mapping_cardinality field

schema/sssom.yaml

@@ -104,6 +104,12 @@ slots:
     description: URL pointing to the source that provided the mapping, for example
       an ontology that already contains the mappings.
     range: string
+  mapping_cardinality:
+    description: A string indicating whether this mapping is from a 1:1 (the subject_id
+      maps to a single object_id), 1:n (the subject maps to more than one object_id), 
+      n:1, 1:0, 0:1 or n:n group. Note that this is a convenience field that should be derivable 
+      from the mapping set.
+    range: string
   mapping_tool:
     description: A reference to the tool or algorithm that was used to generate the
       mapping. Should be a URL pointing to more info about it, but can be free text.
@@ -232,6 +238,7 @@ classes:
     - object_source
     - object_source_version
     - mapping_provider
+    - mapping_cardinality
     - mapping_tool
     - mapping_date
     - confidence