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> > xml:id and/or xml:idatts > can be layered on top of XML 1.0 without changing anything > about XML 1.0. What does "without changing anything about XML 1.0" mean, exactly? Could the xml+id processor be actually layered on top (or in front of) an XML 1.0 processor without changing the DTD validation logic? Does it mean that valid and well-formed XML 1.0 documents will continue to be so in xml+ids? How about schema processors; will an "old" schema processor interoperate with an xml+ids XML processor? One question (brought up by Michael Kay in an internal discussion): "is xml+id" non-uniqueness a well-formedness error, or will it be some sort of low-level validation error? Presumably a well-formedness error, since non-validating parsers have no notion of "validation". BUT if there is a schema-defined ID and a XML+id-defined ID that clash, it is presumaby a validity error, because schemas only apply to well-formed XML documents ... andy anyway this implies that the schema processor knows about xml+id. These potential complications seem to suggest that doing any more than the bare minimum could start to get hairy. I'm inclined against adding ISO entities, multiple ids/element, namespace support, etc. in the first iteration.
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