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Section 5.3 says that if there's an XPath syntax (or other static) error in the expression between curlies in an AVT, the error codes are as defined by XPath. But Section 5.6 defines an XSLT error code for this situation: error XTSE0360. Michael Kay previously raised as http://lists.w3.org/Archives/Member/w3c-xsl-wg/2005Oct/0037.html
The XSL Working Group discussed this at its meeting on 8 Dec 2005 and accepted the principle that where there is an error in an XPath expression, XSLT should report the XPath error code rather than overriding this with its own. Error XTSE0360 therefore disappears.