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Element extends
Description A rule element can have one or more extends elements. These have a rule attribute, which is the identifier of another rule, which must have abstract = "yes". Contents of such abstarct rule replaces extends element.
Attributes
rule Identifier of the rule whose content should replace extends element.
Parents rule
DTD 
<!ELEMENT extends EMPTY>
<!ATTLIST extends
             rule IDREF #REQUIRED>

Examples
Example 1 An example of abstract rule usage.



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