IMO, these two examples are additional use cases calling for extensibility of XML schema languages.
Eric
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From: Eric van der Vlist <vdv@dyomedea.com>
To: Jonathan Borden <jborden@attbi.com>
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On Thu, 2002-06-27 at 13:30, Jonathan Borden wrote:
> Recognizing and processing natural language is something that's been done
> for a couple of decades -- albeit imperfectly -- and as I am sure you are
> aware, the grammar(s) are complicted -- what is generally needed is some
> notion of the intended semantics of the sentences. In any case, this example
> isn't a good use case for XML schema languages and 'validity'.
No, but it is a good use case for extensibility in XML schema languages.
If you are happy with the result of the unix "file" command to determine
the type of a text and see if it's more likely a Java source code, a
snippet of Python or an English text, you may want to validate the
document using its result instead of the code.
I am actually considering implementing pyxie based transformations into
xvif to allow this kind of features:
http://bugzilla.xmlschemata.org/cgi-bin/bugzilla/show_bug.cgi?id=14
Eric
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From: Eric van der Vlist <vdv@dyomedea.com>
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Hi Jeni,
On Wed, 2002-06-26 at 15:34, Jeni Tennison wrote:
> For example, if you had something like:
>
> <length>12.5<unit>cm</unit></length>
Note that this model is only a (simple) XSLT transformation away from
something more "classical" and that (for instance)
<xsl:transform xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
version="1.0">
<xsl:template match="length/text()[normalize-space()]">
<value>
<xsl:value-of select="."/>
</value>
</xsl:template>
<xsl:template match="*|@*">
<xsl:copy>
<xsl:apply-templates select="@*|*|text()"/>
</xsl:copy>
</xsl:template>
</xsl:transform>
would transform it into
<length><value>12.5</value><unit>cm</unit></length>
which is much easier to validate with any schema language.
That's here that xvif can help and let you write:
<?xml version="1.0" encoding="iso-8859-1"?>
<element xmlns="http://relaxng.org/ns/structure/1.0" name="length">
<if:transform type='http://www.w3.org/1999/XSL/Transform'
xmlns:if='http://namespaces.xmlschemata.org/xvif/iframe'>
<if:apply xmlns="">
<xsl:transform xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
version="1.0">
<xsl:template match="length/text()[normalize-space()]">
<value>
<xsl:value-of select="."/>
</value>
</xsl:template>
<xsl:template match="*|@*">
<xsl:copy>
<xsl:apply-templates select="@*|*|text()"/>
</xsl:copy>
</xsl:template>
</xsl:transform>
</if:apply>
</if:transform>
<element name="value">
<text/>
</element>
<element name="unit">
<text/>
</element>
</element>
(this is embedded into Relax NG but I am pretty confident that this
could be implemented on top of WXS as well).
Eric
PS: you can try it on
http://downloads.xmlschemata.org/python/xvif/tryMe.cgi
--
See you in San Diego.
http://conferences.oreillynet.com/os2002/
------------------------------------------------------------------------
Eric van der Vlist http://xmlfr.org http://dyomedea.com
(W3C) XML Schema ISBN:0-596-00252-1 http://oreilly.com/catalog/xmlschema
------------------------------------------------------------------------
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Received on Thu Jun 27 14:15:42 2002
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