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