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The specification of parse-ietf-date refers (non-normatively) to various RFCs which should be listed in the non-normative references at the end of the document.
Also, this example is obviously wrong: The expression fn:parse-ietf-date("Wed Jun 06 11:54:45 EST 2013") returns xs:dateTime("1994-06-06T11:54:45-0500"). The year doesn't match.
Also (not strictly editorial, but uncontroversial), the spec fails to say that when the argument is an empty sequence the result is an empty sequence.
The editorial problems with parse-ietf-date have now been fixed.