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RE: [xsl] How to check an element's type against an XSD simpleType and skip that element if it does not conform to the simpleType?


Subject: RE: [xsl] How to check an element's type against an XSD simpleType and skip that element if it does not conform to the simpleType?
From: "Costello, Roger L." <costello@xxxxxxxxx>
Date: Tue, 16 Jul 2013 13:12:56 +0000

Michael Kay wrote:

> you could read an (unvalidated) BOOKLIST and then iterate
> over the BOOK elements, validating each one in turn, catching
> any errors ... and then doing different processing based on
> whether the BOOK was valid or not.

I must not be understanding what you and David are suggesting. Below is an
XSLT program which does (I think) what you guys are suggesting, but it still
generates an error if the XML document has an ISBN element with a value that
is not schema-valid. What is my XSLT program doing wrong?  /Roger

-----------------------------------------------------------------
   Check ISBN using "castable as"
-----------------------------------------------------------------
<xsl:transform xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
               xmlns:bk="http://www.books.org"
               exclude-result-prefixes="bk"
               version="2.0">

    <xsl:output method="xml"/>

    <xsl:import-schema namespace="http://www.books.org"
        schema-location="BookStore.xsd"/>

    <xsl:template match="/">
        <BookISBNs>
            <xsl:for-each select="/bk:BookStore/bk:Book/bk:ISBN">
                <xsl:if test=". castable as bk:ISBN-type">
                    <ISBN><xsl:value-of select="."/></ISBN>
                </xsl:if>
            </xsl:for-each>
        </BookISBNs>
    </xsl:template>

</xsl:transform>

-----Original Message-----
From: Michael Kay [mailto:mike@xxxxxxxxxxxx]
Sent: Tuesday, July 16, 2013 8:56 AM
To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
Cc: Costello, Roger L.
Subject: Re: [xsl] How to check an element's type against an XSD simpleType
and skip that element if it does not conform to the simpleType?


On 16 Jul 2013, at 13:29, David Carlisle wrote:

> On 16/07/2013 13:07, Costello, Roger L. wrote:
>> Michael Kay wrote:
>>
>>> Unfortunately schema-aware processing in XQuery and XSLT doesn't
>>> give you this capability.
>>
>> Is there a workaround?
>>
>> Is there is no way for an XSLT program to express: "Hey, validate xyz
>> against the XML Schema and if xyz is not schema-valid then discard
>> it." No way to express that?
>>
>
> Can't you just not validate the input, then test within the stylesheet
> as you are testing an atomic/simple type.
>

Yes, in fact you could do it at a different granularity; you could read an
(unvalidated) BOOKLIST and then iterate over the BOOK elements, validating
each one in turn, catching any errors using try/catch, and then doing
different processing based on whether the BOOK was valid or not.

Michael Kay
Saxonica


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