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>From: "Bullard, Claude L (Len)" <len.bullard@intergraph.com>
>To: 'Michael Champion' <michael.champion@hotmail.com>
>CC: "'xml-dev@lists.xml.org'" <xml-dev@lists.xml.org>
>Subject: RE: [xml-dev] Declarative XML Processing with XQuery
>Date: Tue, 8 Nov 2005 15:35:03 -0600
>
>Hjelsberg's discussion takes a bit longer to absorb but
>is well worth it.
There are a couple of others that I think are worthwhile for people
interested in LINQ and XML
http://microsoft.sitestream.com/PDC05/DAT/DAT324_files/Default.htm#nopreload=1&autostart=1
http://microsoft.sitestream.com/PDC05/TLN/TLN306_files/Default.htm#nopreload=1&autostart=1
(Mangle the URLs I sent earlier for the FF-friendly components --
s/TLN307/TLN306 , etc.)
>So why exactly do we want to use XQuery or XLinq?
>
>One reason, with my limited practical experience, that
>comes to mind is that this is a lot like Foxpro in that
>Foxpro, being a dedicated database programming language,
>was a lot more productive than doing the same work in say,
>Visual Basic. Having the queries in the procedural language
>(once one mastered USE) was quite powerful and real rapid
>prototyping.
I think that's the main reason -- making queries a first-class feature of
the programming language rather than strings passed to an API. There's also
the tool support (Intellisense, debuggers, etc.) that makes it easier to
learn and remember the query features.
Also, and getting back to the original topic, querying data in lists,
arrays, object graphs, etc. as well as XML trees has a much more
declarative feel to it and allows optimizers to do the heavy lifting to get
efficient navigation over the various data structures. Say what one will
about that's what programmers are supposed to learn in school, the fact
remains that the Hjelsbergs of the world will do it an order of magnitude
better than many of us, and the declarative approach lets us say what we
want to happen, and them generate the detailed instructions to make it
happen.
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