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Related Syntax | Related Concepts | |
operator |
attribute is specified |
Return type: Switch
Returns: A value of true when the attribute has a value; otherwise, false.
Syntax
attribute attribute-name element-qualifier* (is | isnt) specified
An attribute test that succeeds when the referenced:
The test fails otherwise. Using isnt
instead of is
reverses the results.
Unlike all other attribute references, no error occurs if the specified attribute does not exist, or was not given a value (since the test does not actually use the value).
If the element-qualifier references an element that does not exist, or if the specified attribute is not declared, the is
form of the test always fails, and the isnt
form always succeeds.
Related Syntax |
Related Concepts |
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