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   Re: Query Languages for XML

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  • From: Joe Lapp <jlapp@acm.org>
  • To: xml-dev@ic.ac.uk
  • Date: Sun, 16 Nov 1997 14:33:42 -0500

Paul Prescod <papresco@technologist.com> wrote:
>[...] As I understand it, you can create a
>"HTML form element" flow object and an "HTML input element" flow object
>within it. [...]
>DSSSL has no provisions for adding flow object types in DSSSL code. So
>we are essentially talking about the DSSSL implementation language (Java
>or C, probably) [...]

I'm not sure that this approach addresses the need to have a standard
mechanism by which (server-side) XML documents are updated.  We'd simply
be relegating the standard to being defined by OMG IDL interfaces, as is
done in DOM.  We could rely on (future) DOM-defined query mechanisms,
except that the DOM approach does not provide the kind of flexibility
that an XML-based language would provide.  For example, in the DOM
approach, our queries must be programs, whether they are written in Java,
C, C++, VB, or some script language.  But then we'd wish we had defined
the script language.  User's wouldn't have to learn a different language
for generating queries on each platform, and the queries themselves
would be transportable between platforms.

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