[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: XML query languages and their encodings
Mark Birbeck wrote: > > I sort of guessed it might be ;-) I was more getting at the idea of > context. The following is a 'list of nodes': > > <name>Mark</name> > <name>Tracey</name> > <name>Jan</name> That's exactly my point. That's not a list of nodes. That's a list of XML elements. Nodes are abstract. Here's a concrete representation for them (and a containing element) for discussion purposes: x= element( gi: "names", content: element( gi: "name", content: text( "Mark")) element( gi: "name", content: text( "Tracey")) element( gi: "name", content: text( "Jan")) ) Now in this abstract model a "list of nodes" is: [x.content[0], x.content[1], x] Do I know their context? Yes. Do I know their depth? Can I talk about nodes of different depths? Yes. In this brain-dead simple abstract model those issues are not complex at all. Now if we want to encode these results for transmission between machines then all of the issues you raise are important. But that is a *separate issue*. It has nothing to do with the abstract concept of "node list". "XML People" are encoding-focused so they always come back to the encoding. That's fine but it is also important to recognize that some things should be considered in the abstract domain -- like the result sets of query languages. -- Paul Prescod - ISOGEN Consulting Engineer speaking for only himself http://itrc.uwaterloo.ca/~papresco "Other Operating Environments Will Have Trouble Keeping up with Linux's Growth" - http://www.idc.com/Data/Software/content/SW033199PR.htm International Data Corporation bulletin 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/ and on CD-ROM/ISBN 981-02-3594-1 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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