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The text "Warn implementers to create extensions that do not interfere with conformance." is unclear. It would perhaps be better worded as "Warn implementers not to create extensions that interfere with conformance." There are also some assumptions here about who is doing the extending. Its assumed to always be "implementors". There are several possible classes of extender - implementors, the original spec writers, writers of another spec that uses the first spec, users ..... it is perfectly possible to define an extension that does affect conformance, and indeed this case is discussed elsewhere in the QA Specification Guidelines document. This case is where the extension (spec version n+1) removes something that existed in spec version n (perhaps spec version n had deprecated it already). Thus, content conforming to spec version n and using deprecated features is no longer conformant to spec version n+1 and this is expected and encouraged.
Implementers are not the only one creating extensions. Need to express this. We have replaced "implementers" with "extension creators."
ACTION: reword Warn implementers not to create extensions to Warn extension creators not to create extensions [done] ACTION: add paragraph in 4.3 introduction about various types of extension creators Dom 15 March RESOLUTION: agree with the TAG and will make appropriate changes to the
the GP now reads " Warn extension creators to create extensions that do not interfere with conformance." with a note about who extension creators are in "what does it mean": """ What does it mean? Include in the specification a warning to those who are creating extensions that extensions should not contradict or negate conformance to the original specification. Extensions can be created in different context: directly by implementors, in other specifications, etc. """
setting version to LC in case of future use