[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: XML-QL
Jonathan: We can sink our teeth into this elusive spec so we can compare them head to head? Is there a URL available? I'm doing a query language round up for xml.com So far I've got: SQL (of course) XPointer XML-QL XQL? Appel... more? thanks everybody, lisa Jonathan Robie wrote: > > At 11:19 AM 9/1/98 +0100, Michael Kay wrote: > > >My immediate reaction is to compare this not with SQL, but > >with the new XSL "tree construction" facilities which > >essentially provide an XML transformation language. I don't > >have time to do a detailed point-by-point comparison but it > >would certainly be a useful exercise. Conceptually they have > >many similarities but there are many points of detail where > >one is stronger than the other. I would think it is entirely > >possible to devise a language that combines the power of > >both without a significant loss of usability. > > In fact, at Metastructures 98 I presented a language called XQL that uses a > syntax very similar to XSL Patterns. This language was developed primarily > by Joe Lapp of webMethods and me. Like XML-QL, XQL is declarative. > > One of the significant differences between XML-QL and XQL is that XQL can > do both hierarchy and sequence. The fundamental structural relationships in > XQL are: > > o hierarchy > > o parent/child > o ancestor/descendant > > o sequence > > o precedes > o immediately precedes > > o position > > o subscripts > o ranges > > I think sequence is pretty important in documents, though it is not > important in many data-oriented systems. XML-QL's heritage in relational > theory has caused it to ignore sequence. > > Jonathan > > jonathan@t... > Texcel Research > http://www.texcel.no > > 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...) 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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