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fn:key

fn:key(
   key-name as xs:string,
   key-value as xs:string,
   [top as node()]
) as node()*

Summary

The key function does for keys what the id function does for IDs.

This function is only available in XSLT; it is not available in XQuery or JavaScript.

Parameters
key-name The name of the key.
key-value The value of the key.
top The subtree to limit the results to.

Example

See the examples in the Keys section of the XSLT Specification.

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