XML query language
Paul Prescod <paul@p...> wrote: >Oren Ben-Kiki wrote: >> I fail to see the benfit in inventing a new format for query results. > >It isn't about a format. Query languages do not typically work on formats. >They have an input data model (i.e. a relational data base) and they have >an output model (i.e. a set of records). An XML Query Language should also >work in terms of the XML data model (the information set). Agreed. >Let's put it this way: you are saying that the query engine should build a >list of pointers, build a tree, generate XPointer attributes just so that >an application can get back the original list of pointers! I don't follow. You yourself have said: >The IDL for an XML QL should be something like: > >NodeList XMLQuery( DOC doc, String query ) Well, them, what other way is to return a list of XPointers then to store each in an "element"? This is assuming that you prefer the query engine to return a list of pointers as a result, which I don't. The one nice thing about this scheme is that you can add extra data per XPointer - a relevancy score, for example. I did mistakenly say: >> AFAIK all XML QL proposals produce XML as output. > >No, XQL goes out of its way to NOT require that the output be XML. "The >specification does not indicate the output format. The result of a query >could be a node, a list of nodes, an XML document, an array, or some other >structure. That is, XQL does not dictate the binary format of the returns, >but rather the logical returns." The same is true of XSL patterns. I stand corrected. I think you've phrased it perfectly above - the output should be defined in the terms of the XML data model. Have fun, Oren Ben-Kiki 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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