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8.1.5 Extension 8.1.6 Mixed content E.1.5.2 Nil-annotate 8.1.5 / Sem / rule 1 8.1.6 / Sem / rule 1 E.1.5.2 / Sem / rule 3 "Type1 = AttributeAll1 , ElementContent1" What does this mean? 'AttributeAll' and 'ElementContent' aren't non-terminal names. 'ElementContent' is used in 4.7.1 to mean "element content unit", which is something appearing in a direct element constructor, which is presumably not relevant here. (leftover from last year, comment #203)
I believe the corresponding definitions were removed by mistake. They capture restrictions on types that apply to the description of an element (attribute declarations followed by a content model). I added them back in Section 2.4.3 Content models which seems a good place. Also renamed them to 'AttributeModel' and 'ElementModel' to avoid confusion with auxiliary grammars and judgment used in the sections on constructors. - Jerome