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   Unclear Part of XML 1.1 Specification

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Hi all,
From section 6 of the XML spec, I have learned that:
* binds tighter than |
 + binds tighter than |
but there is no mention of the precedence of the '-' (set difference) operator. At least for me, this makes reading the spec pretty tricky (since I don't
know much XML yet). Could someone explain where '-' fits in, perhaps by using the document ::= production, using () to clearly show how '-' works?


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