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RE: The use of XML syntax in XML Query

• To: Michael Rys <mrys@m...>
• Subject: RE: The use of XML syntax in XML Query
• From: Murali Mani <mani@C...>
• Date: Thu, 3 Jan 2002 11:08:05 -0800 (PST)
• Cc: <www-xml-query-comments@w...>, <xml-dev@l...>
• In-reply-to: <5C39F806F9939046B4B1AFE652500A3A478F0B@R...>

A very old and simple version of XQueryX -> XQuery converter (written more
than a year ago) -- is available at
http://www.cs.ucla.edu/~mani/abql/Converter.java

also http://www.cs.ucla.edu/~mani/abql/ -- give a few samples for the
conversion.. I think this was prepared for checking correctness of the
queries in the then ABQL specification.

This shows the simplicity of this conversion -- one can guess that this
conversion will be simple because an ABQL query was a parse-tree
representation of a Quilt query.

I believe anyone can use it for their own purposes if they find it
adequate. Also, please check the validity of this with the latest syntax,
for your own use.

Wishing everyone a very happy New Year 2002.

cheers and regards - murali.

On Thu, 3 Jan 2002, Michael Rys wrote:

> You can write an XSLT transform today that takes XQueryX and generates
> XQuery.
>
> Also note that XQuery has the element {} {} and attribute {} {}
> constructors that you can use as an alternative to the angle-bracket
> constructors if you embed XQuery inside XML.
>
> Best regards
> Michael
>
> > -----Original Message-----
> > From: Michael Kay [mailto:michael.h.kay@n...]
> > Sent: Thursday, January 03, 2002 9:58 AM
> > To: 'Jonathan Robie'; 'Elliotte Rusty Harold'; 'Henry S. Thompson';
> 'David
> > Carlisle'
> > Cc: www-xml-query-comments@w...; xml-dev@l...
> > Subject: RE:  The use of XML syntax in XML Query
> >
> > > >>>2. The XPath solution: Make all XQueries look nothing like XML
> > > >>>documents; i.e. no tags, no elements, no attributes
> > > >>
> > > >>Computed element constructor syntax allows this. Here is
> > > Henry's example
> > > >>done in computed element constructor syntax, where the
> > > wrapping element
> > > >>is in the XML document, and nothing in the query per se
> > > looks like XML:
> > > >
> > > >I haven't seen this before. It does look like a possible solution.
> > > >However, you still need to eliminate the non-computed
> > > element constructor
> > > >syntax, which will still cause all the problems of user
> > > confusion on its
> > > >own, even if a non-confusing alternative exists.
> > >
> > > I'm not convinced that we need to remove the angle-bracket
> > > notation for
> > > element constructors. In queries that are not embedded in an
> > > XML document,
> > > I don't think that they cause users to be confused.
> >
> >
> > Is there a possibility of a solution in which the XML-like syntax
> becomes
> > pure XML, and is regarded as a preprocessor syntax, so that a query
> > written
> > as a well-formed XML document (using element constructors for
> elements,
> > processing instructions for PIs, and comments for comments) can then
> be
> > translated mechanically into an XQuery expressed as a Unicode string,
> > which
> > itself uses no XML-like constructs?
> >
> > This would mean the Unicode-XQuery syntax wouldn't need to include all
> the
> > XML-like constructs, greatly simplifying parsing, while the XML-XQuery
> > syntax would be pure XML and therefore manipulable using all XML
> tools.
> > The
> > translation from XML-XQuery to Unicode-XQuery could almost certainly
> be
> > specified and indeed implemented in XSLT.
> >
> > I think this would also satisfy the real user requirement behind
> XQueryX.
> >
> > OK, there's timescales. But the reason we put drafts out for comment
> is to
> > get comments!
> >
> > Mike Kay
> >
> >
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    • From: "Michael Rys" <mrys@m...>

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