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- <!-- In my view, this isn't an error because (A? | B) is inherently
- optional, and therefore is treated as if it were (A? | B)?
- [414:10-12]. Excluding A has the same effect as if the group were
- (B)?, and there if therefore no change to the required or optional
- status of the group. -->
- <!doctype doc [
- <!element doc - - (a? | b) -(a)>
- <!element (a | b) - - (#pcdata)>
- ]>
- <doc>
- </doc>
-