==== unique() Function ====

The unique() function filters and returns the given collection using the key XPath expression to calculate a key for each node in the collection.

Only the first node for a given key will be returned.


^ Argument      ^ Kind   ^ Required    ^ Purpose          ^
|**collection**  |nodes  |yes  |an XPath expression that resolves to a collection of nodes   |
|**key**  |string  |yes  |a string containing an XPath expression that resolves to a key value for a given node   |

=== Usage and examples ===

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