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The minutes of the recent Boston F2F record an agreement that each document in which one or more items are defined to be implementation-defined or implementation-dependent will have an appendix summarizing each such item. Andrew Eisenberg surveyed the suite of XPath/XQuery-related documents. His survey revealed that, of the Last Call documents having implementation-defined and -dependent item, only the Functions and Operators document had no such appendix.
Appendix of implementation-defined features added to F&O. Ashok Malhotra
Closing bug because commenter has not objected to the resolution posted and more than two weeks have passed.