- From: Jukka K. Korpela <jkorpela@cs.tut.fi>
- Date: Sat, 19 Feb 2011 15:54:05 +0200
- To: "Paul Gilmartin" <PaulGBoulder@aim.com>, <www-validator@w3.org>
Paul Gilmartin wrote: > http://www.hlasm.com/english/opl_cobm.htm > > contains numerous links with backslashes in URLs, such as: > > http://www.hlasm.com/english/opcd\A.htm > > (although the author may be in the process of fixing them). It seems that such problems have been fixed in the document; it no more contains any "\" character. > RFC 1738 says backslashes are unsafe and must be escaped: The generic definitions in RFC 1738 were replaced by RFC 2396 in 1998. The current RFC on generic URL syntax is RFC 3986 (from year 2005), which is an Internet-standard (STD 66). When considering a reference to an RFC, use http://www.rfc-editor.org to check the status of the RFC. In this particular issue, the generic URL syntax hasn't changed: "\" is allowed in a URL as %-encoded only. This is a consequence of rules that specify allowed characters and require that other characters be %-encoded. The backslash "\" is no more mentioned separately; it just doesn't appear in the set of characters that may appear as such. > w3's HTML validation fails to report this RFC violation. Validation in the SGML or XML sense does not include any checks on what characters may appear in a URL. The URL-valued attributes are declared as CDATA, and DTDs cannot express things like URL syntax. > It should > because browser treatment of this invalid usage is inconsistent: > MSIE treats '\' as if it were '/'; Firefox simply passes it on as '\', That's an important problem indeed. > and the w3's own link validator encodes it as '%5C'. The link checker is a useful tool, which will, en passant, mostly detect problems of this type - since usually authors have meant "/" when they have written "\", so it is good that the link checked treats it as "%5C". It would be even better to report "\" as an error. A link checker (rather than a markup validator) could and should do such things. -- Yucca, http://www.cs.tut.fi/~jkorpela/
Received on Saturday, 19 February 2011 13:54:51 UTC