feat: if 2 uris have same fragment ,add _bis

(capitalize difference only)

owl2yams/__init__.py

@@ -150,10 +150,7 @@
             print(f"Warning: data property {datatype_property_uri} could not be parsed")
             continue
         if datatype_property_uri_fragment in schema:
-            raise ValueError(
-                f"Error: attribute {datatype_property_uri} already defined "
-                f"({relationtype_fragment_to_uri[datatype_property_uri_fragment]})"
-            )
+            datatype_property_uri_fragment = datatype_property_uri_fragment + "_bis"
         schema.add_relation_type(RelationType(datatype_property_uri_fragment))
         relationtype_fragment_to_uri[
             datatype_property_uri_fragment