[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: words (RE: extensibility in XSchema?)
At 23:50 22/06/98 +1000, Rick Jelliffe wrote: [...] > >This is why the particular word "semantics" is worthless. People >use it so equivocally that sentences containing the word are rendered >useless. I try to avoid the word now. I try to stick with SGML's > text = data + markup >and use "data" and "information" wherever possible. I'll buy this - at least to the extent that I shall try to avoid the term semantics. However I need *some* terminology to describe what I want to do. Perhaps we can converge on some of that (given also that spec drafters are also trying to firm up *some* of the terminological problems). I shall use the word 'meaning' at present. I'm a pragmatist and need to address the following problems: - how do I add human 'meaning' to an object (e.g. an element or attribute)? - how do I add machine 'meaning' to an object? At present there are *no* defined mechanisms for either of these in XML. I find this amazing and regrettable (I - and others such have Rick) have been shouting for it). Consider: <foo bar="baz"/> That's it. All we can say is there is a foo element with a bar attribute whose value is baz. Now try: <!DOCTYPE foo SYSTEM "foo.dtd"> <foo bar="baz"/> The DOCTYPE adds the meaning, doesn't it? Nope, it says the following: - the root element is a foo element. But we know that already. It does NOT define the document as of type 'foo'. - there is a DTD whose sole purposes are: - to expand minimisation (irrelevant for this document) - to validate the document. Yes, you can fill the DTD with comments, but they have no formal meaning and there is no way even of knowing which comment belongs to which element apart from guessing. It is even worse with attributes, unless each exists in a single <!ATTLIST> Now compare MIME: If I get sent a file of type image/gif I can: - determine that 'image/gif' is a MIME type - see if it is in the central IETF registry. If so I can read the formal definition, etc. - *and most important for me* I can associate the MIME type with a program through the mailcap file, *even if the MIME type is not registered*. This is all I am asking for, but there seems to be no way to do a similar thing for an XML element or attribute. This is what I used to call semantics. If someone can come up with a better term, it would be useful. RickJ uses the word 'bind' - I like that. P. Peter Murray-Rust, Director Virtual School of Molecular Sciences, domestic net connection VSMS http://www.nottingham.ac.uk/vsms, Virtual Hyperglossary http://www.venus.co.uk/vhg 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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