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Posted by David Hεsδther on 05/31/06 15:56
Michael Winter <m.winter@blueyonder.co.uk> wrote:
> On 31/05/2006 14:57, Stewart Gordon wrote:
>
> [snip]
>
>> <!DOCTYPE HTML SYSTEM"http://eb.cx/2ef"><title//.
> ^^
> The SGML grammar requires at least one white space character
> between the 'SYSTEM' literal (or public identifier) and the system
> identifier, so I don't think that quite qualifies. :-P
>
> [73] external identifier (10.1.6, 379:1) =
> ( ( "SYSTEM"
> | ( "PUBLIC",
> +ps [65],
> public identifier [74] ) ),
> ?( +ps [65],
> system identifier [75] ) )
No, it requires a _parameter separator_. However, those are not
required in all circumstances. The SGML Handbook (372:15) says this:
| A required ps that is adjacent to a delimiter or another ps can be
| can be omitted if no ambiguity would be created thereby.
Therefore, the document type declaration above is correct.
> As far as I know, the system identifier is a URI reference so a
> relative reference (such as a single letter) is permissible, but I
> could very well be wrong.
You're right.
> In the previous discussion, Jukka seemed
> to imply that an absolute URL was necessary, but that could have
> been due to a limitation of the W3C Validator (which was the
> required validator for the challenge).
Yes, I believe the W3C validator only supports absolute URIs.
> So, if a relative reference is allowed, surely /the/ shortest has
> to be:
>
> <!DOCTYPE html SYSTEM "d"><title//. (35 bytes)
With a properly set up catalog, you can do it even shorter since e.g.
"<!DOCTYPE HTML>" is a syntactically correct document type declaration.
Something like the following should be able to validate against any
HTML DTD:
<!doctype p><p>
Again, this needs a properly set up catalog.
I'm not going to dig deeper into this though, since I don't really see
the point in this exercise :-)
--
David HΓ₯sΓ€ther
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