[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: A different comment syntax question
Makoto replies: > Rob Cameron wrote: > > > > If, as I assume, the answer is that only the double hyphen case > > is a concern, then the grammar needs to be changed. > > > > Comment ::= '<!--' (Char* - (Char* '--' Char*)) '-->' > > > > This is semantically identical to the current rule: > > Comment ::= '<!--' ((Char - '-') | ('-' (Char - '-')))* '-->' > No, I don't think it is equivalent. Proof: (a) No string in (Char - '-') ends with a hyphen. (This is the set of all single character strings except the hyphen.) (b) Thus, no string in ('-' (Char - '-')) ends with a hyphen. (c) Thus, no string in ((Char - '-') | ('-' (Char - '-'))) ends with a hyphen. (d) Thus, no string in ((Char - '-') | ('-' (Char - '-')))* ends with a hyphen. Robert D. Cameron, Associate Professor cameron@c... School of Computing Science FAX: (604) 291-3045 Simon Fraser University Burnaby, B.C., Canada V5A 1S6 Internet Electronic Library Project at SFU http://elib.cs.sfu.ca/ xml-dev: A list for W3C XML Developers. To post, mailto:xml-dev@i... Archived as: http://www.lists.ic.ac.uk/hypermail/xml-dev/ To (un)subscribe, mailto:majordomo@i... the following message; (un)subscribe xml-dev To subscribe to the digests, mailto:majordomo@i... the following message; subscribe xml-dev-digest List coordinator, Henry Rzepa (mailto:rzepa@i...)
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