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The following seems to imply that all inputs, outputs, and query modules must conform to the same sets of rules: <quote> Whether the implementation is based on the rules of [XML 1.0] and [XML Names] or the rules of [XML 1.1] and [XML Names 1.1]. One of these sets of rules must be applied consistently by all aspects of the implementation. If the implementation is based on the rules of [XML 1.0], the edition used must be at least Third Edition; the edition used is implementation-defined, but we recommend that implementations use the latest version. </quote> I think our spec does allow switches to choose which rules are applied, but it does not provide for environments where inputs, outputs, and query modules can each use a different set of rules.
After today's telcon, I think we're heading in this direction: 1. Data model always supports XML 1.1 2. The conformance section says XML processors SHOULD NOT impose restrictions on the use of characters allowed by some versions of XML and disallowed by others. 3. Eliminate all the "Whether the implementation is based on the rules of [XML 1.0] and [XML Names] or the rules of [XML 1.1] and [XML Names 1.1]" language in XQuery 3.0 / XPath 3.0. 4. Serialization can still decide which version to support 5. What about parse-xml()? Is it subject to rule 2 above?
This is closed now, adopting the wording in this message: https://lists.w3.org/Archives/Member/w3c-xsl-query/2012Mar/0094.html