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It would be extremely useful to see a mechanism like the following to allow further extensibility of XQuery: http://lists.w3.org/Archives/Member/w3c-xsl-query/2010Feb/0204.html http://jpcs.posterous.com/proposal-to-add-function-annotations-to-xquer
to add a recent datapoint, my recent impl of Adam Retter's RESTXQ for marklogic https://github.com/xquery/rxq required the usage of ML xdmp:functions and xdmp:annotation functions to get a list of functions in the current environment and what annotations a function may have. having these functions exist would help promote a more language neutral solution
Assigning to future requirements per Working Group decision (https://lists.w3.org/Archives/Member/w3c-xsl-query/2012Oct/0087.html).