For the die-hards, or if you care about the details, the W3C has published the first errata for XQuery 1.0 and accompanying specifications.
Errata for XQuery 1.0: An XML Query Language
Errata for XQuery 1.0 and XPath 2.0 Functions and Operators
Errata for XQuery 1.0 and XPath 2.0 Data Model (XDM)
Errata for XSLT 2.0 and XQuery 1.0 Serialization
Errata for XQuery 1.0 and XPath 2.0 Formal Semantics
Errata for XML Syntax for XQuery 1.0 (XQueryX)
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