The sort() function sorts and returns the given collection using the key XPath expression to calculate a sort key for each node in the collection.
|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|
|options||string||no||contains some combination of “asc”, “desc”, “string” and “number”. Defaults to “string asc”|
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