Add an xref on the definition

src/patterns/dosdp-patterns/bone_length_from_to.yaml

@@ -37,6 +37,7 @@ vars:
   from: "'anatomical_entity'"
   to: "'anatomical_entity'"
   fovt: "'physical_object_quality'"  # FOVT id
+  def_ref: "xsd:string"
 
 name:
   text: "%s length from %s to %s"
@@ -52,7 +53,7 @@ annotations:
       - bone
 
   - annotationProperty: xref
-    text: "FOVT:%s"  # give FOVT id here
+    text: "%s"  # give FOVT IRI here
     vars:
       - fovt
 
@@ -62,6 +63,12 @@ def:
     - from
     - bone
     - to
+  annotations:
+    - annotationProperty: xref
+      text: "%s"
+      vars:
+        - def_ref
+
 
 logical_axioms:
   - axiom_type: subClassOf