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In section 1.1 Conformance, I read: Authors of conformance criteria for the use of the Functions and Operators should pay particular attention to the following features: * Support for XML 1.0 and XML 1.1 by the datatypes used in Functions and Operators. But I cannot find anywhere in the document that says what the support implications are. This is also true of section 7 Conformance in Data Model. I presume the intention is that of section 4.1 in XSLT 2.0 document, but if so, shouldn't it be specified here, too?
The two Working Groups discussed this question at our call of 3 January 2006. We agreed that greater clarity is desirable, but this is made difficult by the inherent murkiness of the situation. The support implications of XML 1.1 are not specified, and not to be specified, in the F and O specification, since it has no independent conformance clause: implementations don't conform to F and O, only to XQuery or XSLT or some other spec which refers normatively to F and O. It is those specifications which must specify what the support implications are; the intent of this bullet is to remind the authors of those specifications that they need to consider them. As you observe, the implications have been considered by the authors of the XSLT spec. We cannot say quite the same thing here O as is said in XSLT 2.0 or in XQuery 1.0, since it is up to those who refer to F and O to decide what to do about the interaction of XML 1.1 and the datatype system; XSLT and XQuery have made a concrete decision, but only one of the possible concrete decisions on the question. We agreed to instruct the editor to a Note to the bullet item in question in F and O section 1.1 Conformance, reading something like this: At the time of writing there is no published version of XML Schema that references the XML 1.1 specifications. This means that datatypes such as xs:NCName and xs:ID are constrained by the XML 1.0 rules. Authors of conformance requirements for the use of Functions and Operators should state clearly the implications for conformance of any changes to the rules in later versions of XML Schema. (The wording of the last sentence is to be changed by the editor as deemed appropriate.) Please let us know whether you agree with this resolution of the issue by either changing the status of the issue to Closed, if you agree, or to Reopened, if you do not agree. If we don't hear from you in the next three weeks, we'll assume you are satisfied by the resolution of the problem.
Added note to conformance section as decided on 2006-01-03 telcon.