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2.4.3 Content models [25 (Formal)] Occurrence ::= "*" | "+" | "?" It would be simpler to just use OccurrenceIndicator. "but it more general has it applies to arbitrary types" Insert "is" before "more" Change "has" to "as". "Where the interleaving of two sequences of items ..." This is not a sentence. s/. Where/, where/ or s/Where the/The/ para 4 & 5 (Both beginning with 'The "&" operator') There's a lot of overlap between these two paragraphs. "Types precedence order: Associativity" As far as I can tell, all three binary operators are associative, i.e. (A op B) op C = A op (B op C) so there's no need to define their associativity. And associativity of unary operators is meaningless.