contentSchema: type MUST be a schema and instance MUST follow the data model

Author: ssilverman

jsonschema-validation.xml

@@ -1017,13 +1017,16 @@
                 <t>
                     If the instance is a string, and if "contentMediaType" is present, this
                     property contains a schema which describes the structure of the string.
+                    The string MUST be in a format compatible with the data model defined in the
+                    <xref target="json-schema">core JSON Schema.</xref>
                 </t>
                 <t>
                     This keyword MAY be used with any media type that can be mapped into
                     JSON Schema's data model.
                 </t>
                 <t>
-                    The value of this property SHOULD be ignored if "contentMediaType" is not present.
+                    The value of this property MUST be a valid JSON schema. It SHOULD be ignored if
+                    "contentMediaType" is not present.
                 </t>
             </section>