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See thread at http://lists.w3.org/Archives/Public/public-i18n-its/2006OctDec/0043.html . Summary: XSLT patterns like in e.g. <xsl:template match="pattern">... allow only for a subset of XPath. The ITS selector attributes allow for full XPath expressivity. We need to give adivce for people who use XSLT what XPath subset is safe to be used.
Closed with text proposal at http://lists.w3.org/Archives/Public/public-i18n-its/2006OctDec/0087.html .