Add str and datetime.time to xsd:time coercion mapping

Author: pkalita-lbl

linkml_runtime/processing/referencevalidator.py

@@ -72,7 +72,7 @@
     "xsd:decimal": Decimal,
     "xsd:dateTime": (str, datetime.datetime, datetime.time, XSDTime),
     "xsd:date": (str, datetime.date, XSDDate),
-    "xsd:time": XSDTime,
+    "xsd:time": (str, datetime.time, XSDTime),
 }