Re: Schema Namespace name, schemaLocation, and Schema V ersi
> I am of the opinion that if the namespace name does not change, then > the semantics of an XML-based markup language should not change > either. Take a look at the namespace spec. Namespaces are not about semantics they are about names. A language version is usually undersood to share some named constructs with other versions of the same language. If it doesn't then it is not a new version, it is a new language. > Designing languages for the W3C is not like working on a college > homework assignment where you can plead with your favorite > professor/teaching assistant/etc to allow you to fix your mistakes > after the fact or let you slide just once. The W3C's decisions affect > thousands of developers and millions of computer users > worldwide. Unfortunately it seems like the members of its working > groups have completely lost site of this fact and act like they are > designing research projects and prototypes which can be continually > tweaked until they get it just right regardless of the impact of this > haphazardness on consumers of these standards. I'm not sure if you meant that to be insulting, or if it just came over that way by accident. Keeping namespaces stable has many benefits. Consider XSLT for example an XSLT processor needs to know straight away what elements are XSLT and which are foreign. Because all future versions of XSLT are in the same namespace, it can do this, and have specified behaviour about what to do if it discovers a (presumably new) construct in a newer version of the language. If new versions of XSLT were in different namespaces it would be impossible to specify this forward compatible behaviour and newer XSLT namespaces would just look like literal result elements. This would be a lot less useful. The cannonical argument in the 3 namespaces for html was as follows The point of namespaces is that you can mix elements from different namespaces. If in your private document type you want to use html linking semantics, you just want to go <html:a href=... It should be possible for any relevant processor to know the xhtml namespace, so know that this is xhtml linking. It doesn't really matter that the content model of some elements changes or some new elements get added between XHTML n and XHTML n+1. If the "language is still XHTML" should by synonymous with "the language uses the same namespace". Changing namespaces changes the name of every construct and so _breaks_ every tool that uses the language. It's because doing that to "millions of computer users" isn't helpful that I query your desire to change namespaces as often as possible. David _____________________________________________________________________ This message has been checked for all known viruses by Star Internet delivered through the MessageLabs Virus Scanning Service. For further information visit http://www.star.net.uk/stats.asp or alternatively call Star Internet for details on the Virus Scanning Service.
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