Document root is only SHOULD for $id.

$id requirements for document root are already covered, and shouldn't be overriden.

Author: Relequestual

jsonschema-core.xml

@@ -1852,9 +1852,9 @@
                         Schema Resources within the referreing document.
                     </t>
                     <t>
-                        Each embedded JSON Schema Resource (and the document's root) MUST identify itself
-                        with an absolute URI using the "$id" keyword, and SHOULD make use of the "$schema"
-                        keyword to identify the dialect it is using, in the root of the schema resource.
+                        Each embedded JSON Schema Resource MUST identify itself with an absolute URI using the "$id" keyword,
+                        and SHOULD make use of the "$schema" keyword to identify the dialect it is using, in the root of the
+                        schema resource.
                     </t>
                     <t>
                         When a by-reference applicator is dereferenced as part of the bundling process, the Schema Resource