|Attributes||special | tag | uri | xml:lang|
|Parents||item | rule|
|Description||Allows a rule expansion to refer to an existing rule element as part of its definition. This element allows for the development of reusable rules.|
<!ELEMENT ruleref (tag) > <!ATTLIST ruleref uri CDATA #IMPLIED special CDATA #IMPLIED xml:lang NMTOKEN #IMPLIED tag CDATA #IMPLIED >
special : CDATA
Indicates that this rule reference points to a “built-in,” rule. The special rules currently supported are #NULL, #VOID, and #GARBAGE.
tag : CDATA
Specifies the action to be taken if this rule reference participates ...