Merge pull request #983 from handrews/emb-base

Initial base URI for embedded objects.

Author: Relequestual

jsonschema-core.xml

@@ -1612,6 +1612,11 @@
                         <xref target="RFC3986"> RFC 3986 Section 5.1.4</xref>.  It is RECOMMENDED
                         that implementations document any default base URI that they assume.
                     </t>
+                    <t>
+                        If a schema object is embedded in a document of another media type, then
+                        the initial base URI is determined according to the rules of that
+                        media type.
+                    </t>
                     <t>
                         Unless the "$id" keyword described in the next section is present in the
                         root schema, this base URI SHOULD be considered the canonical URI of the