3.9.4 ST_ObjIDRef (Object ID Reference)
This simple type specifies a reference to an object ID. It starts with an optional ‘#’ which is followed by an object ID number or an object name as described in the ST_ObjID simple type (§3.9.3, ST_ObjID).
This simple type's contents are a restriction of the XML Schema token datatype.
The following XML Schema fragment defines the contents of this simple type:
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<simpleType name="ST_ObjIDRef"> <restriction base="xsd:token"/> </simpleType>