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Re: [xsl] In XPath 2.0 can my XSLT program validate the input and check whether the validation succeeded?


Subject: Re: [xsl] In XPath 2.0 can my XSLT program validate the input and check whether the validation succeeded?
From: Michael Kay <mike@xxxxxxxxxxxx>
Date: Sat, 20 Jul 2013 22:36:28 +0100

You can't do it in XPath but you can do it in XSLT:

<xsl:copy-of select="." validation="strict">

Michael Kay
Saxonica

On 20 Jul 2013, at 20:50, Costello, Roger L. wrote:

> Hi Folks,
>
> I want my input XML document to be validated within my XSLT program.
>
> I don't want the input validated when I invoke the transformation; thus, I
do not specify the -val flag when I invoke SAXON.
>
> I want to validate non-atomic values (i.e., elements with complexType).
>
> I want to test whether the validation succeeded.
>
> I want to do this in XPath 2.0.
>
> Is it possible?
>
> EXAMPLE
>
> I have an XML Schema which declares a Book element and a BookType:
> ------------------------------------------------------------------
>    <xsd:element name="Book" type="BookType" />
>
>    <xsd:complexType name="BookType">
>        <xsd:sequence>
>            ...
>        </xsd:sequence>
>    </xsd:complexType>
> ------------------------------------------------------------------
>
> In my XSLT program I import the XML Schema:
>
>    <xsl:import-schema schema-location="BookStore.xsd"/>
>
> In my XSLT program I have a template rule for Book. I want this template
rule to validate the Book against the XML Schema and only output the Book if
validation succeeds. Here is the code that I used:
>
>    <xsl:template match="Book">
>        <xsl:if test="data(.) instance of element(Book, BookType)">
>            <xsl:sequence select="."/>
>        </xsl:if>
>    </xsl:template>
>
> I ran my XSLT program and the output contained no Book elements, even though
I know they are valid.
>
> Here is what I think the problem is: since I did not specify the SAXON -val
flag, the input has no type annotations. Consequently, each Book is not an
instance of a Book element with type BookType and this boolean condition
fails:
>
> 	data(.) instance of element(Book, BookType)
>
> Do I have a correct understanding of what the problem is?
>
> Is there a way to solve this problem? Here is what I seek: (1) don't
validate the input at invoke time, (2) do validate the input within the XSLT
program, and (3) do explicitly check whether validation succeeded.
>
> /Roger


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