[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] XQL and XPointer
Oren Ben-Kiki asks: > Actually, what is the difference between XPointer syntax and XQL (as defined > above)? Both allow matching elements according to the structure of the XML > tree and/or the value of attributes. The syntax is different and the set of > capabilities doesn't exactly match. Is it just due to historical reasons > that XSL isn't using (possibly enhanced) XPointers in its match patterns? Yes the reasons are mostly historical but there are technical issues. The XPointer "model" is to select a contiguous, perhaps non-well formed range of data. The XSL model is to select a list of well-formed, perhaps non-contiguous nodes. I don't think that there is anything wrong from a hypertext-theoretic point of view with having pointers return non-contiguous nodes. And you can simulate non-well-formedness: This is text <EMPH>and this is some</EMPH> more text. ^ ^ In this case we could simulate a link from the first occurence of "is" to the second by selecting the nodes "i","s"," ","t","e","x","t"," ",..., etc. -- Paul Prescod - ISOGEN Consulting Engineer speaking for only himself http://itrc.uwaterloo.ca/~papresco "Perpetually obsolescing and thus losing all data and programs every 10 years (the current pattern) is no way to run an information economy or a civilization." - Stewart Brand, founder of the Whole Earth Catalog http://www.wired.com/news/news/culture/story/10124.html 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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