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| operator | attribute is implied | ||||
| Related Syntax | |||||
| Summary |
Boolean
True or false. |
attribute attribute-name element-qualifier*
((item | @) numeric-expression)? (is | isnt) implied
An attribute test that succeeds when the referenced element or data attribute has no set value, either in the start tag or in the element declaration. Otherwise, the test fails. Using isnt instead of is reverses the results.
For example:
repeat over attributes as this-one
do when attribute this-one isnt implied
output key of attribute this-one ||
"='%v(this-one)'%n"
done
again
Unlike most other attribute references, no error occurs if the specified attribute doesn't 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 the specified attribute is not declared, the is form of the test always fails, and the isnt form always succeeds.
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Related Syntax attribute attributes |
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