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| operator | attribute is | ||||
| Related Syntax | |||||
| Summary |
Boolean
True or false. |
attribute attribute-name element-qualifier*
((item | @) numeric-expression)? (is | isnt)
(cdata | name | names | number | numbers | nmtoken |
nmtokens | id | idref | notation | entity | entities | group)
You can use the attribute is test to determine whether an attribute is of a specified type. For example, the following code will succeed if attribute "foo" is of type "name", and will fail otherwise:
attribute "foo" is name
Attribute type tests can be combined by joining the types with or (|) and parenthesizing them. Note that for a data attribute, a test of its type for id, idref, idrefs, notation, entity, or entities will always fail because those types of attributes cannot be associated with a notation.
Entity and notation attribute tests can be applied directly to attribute values which are declared as entity or notation, or directly to an item of an attribute declared as entities.
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Related Syntax attribute |
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