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Section 3.3 says: Extension attributes may also be used to control what happens to a final result tree once the transformation is complete. They may thus be used to provide additional parameters to the serializer, or to override the serialization behavior specified in 20 Serialization. The working groups decided today that they didn't want to support this behaviour in the serialization spec. Therefore, this paragrgaph needs to change. I didn't get a good sense as to what restrictions we want to impose on implementations in this area. Michael Kay
The XSL WG today agreed wording to be added to the XSLT specification to define the limitations on the use of extension attributes to influence serialization. The XSL WG also agreed changes to the serialization spec to make it explicit that implementations can define additional serialization parameters (namespace-qualified). These changes need to be endorsed by the XQuery WG. Michael Kay for XSL WG
The required changes to Serialization have now been approved. See http://www.w3.org/Bugs/Public/show_bug.cgi?id=1222 The bug is therefore now fixed and closed