September 2003
Intermediate to advanced
336 pages
7h 20m
English
Content preview from Effective XML: 50 Specific Ways to Improve Your XML
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Parameterizing Attributes
Attribute declarations also benefit from parameterization. For example, the type attribute of the Transaction element can be declared as follows.
<!ENTITY % TypeAtt "type"> <!ENTITY % type.extra ""> <!ATTLIST %TransactionElement; %TypeAtt; (withdrawal | deposit | transfer %type.extra;) #REQUIRED>
Now you can change the name of the attribute by redefining the TypeAtt entity or add an additional value by redefining the type.extra entity. For example, the redefinition below adds a balanceInquiry type.
<!ENTITY % type.extra " | balanceInquiry ">
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