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Re: Directed vs Generic Syntax

From: Norman Walsh <Norman.Walsh@Sun.COM>
Date: Thu, 13 Apr 2006 12:18:58 -0400
To: public-xml-processing-model-wg@w3.org
Message-ID: <873bghbg99.fsf@nwalsh.com>
/ Alex Milowski <alex@milowski.org> was heard to say:
| Taking the following example from Jeni Tennison's email:
[...]
| This means the pipeline compiler needs to understand each directed
| syntax--including extension steps.  While this adds to the implementors
| work, I think the end result is far simpler for the user.

But it makes it much more difficult for a pipeline to contain
additional elements that can be safely ignored (extensions or
documentation, for example).

I don't see any semantic distinction between this:

  <p:step name="p:xslt">
    <p:input select="$document" />
    <p:input name="stylesheet" href="foo.xsl" />
    <p:output href="result.xml" />
  </p:step>

and this:

  <p:xslt input="$document" stylesheet="foo.xsl"
          output="result.xml"/>

except that you've obscured the inputs and outputs from the point of
view of a reader and you've reduced the number of characters that have
to be typed a little bit.

After some consideration, I think I prefer <p:step name="p:xslt"> to
<p:xslt> and I am confident that I prefer <p:input> and <p:ouput> over
attributes. For one thing, it means that I can do this:

  <p:step name="p:xslt">
    <p:input name="document">
      <doc>
       <p>Some data</p>
      </doc>
    </p:input>
    ...

                                        Be seeing you,
                                          norm

-- 
Norman.Walsh@Sun.COM / XML Standards Architect / Sun Microsystems, Inc.
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Received on Thursday, 13 April 2006 16:19:07 GMT

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