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?

["G. Ken Holman" <gkholman@xxxxxxxxxxxxxxxxxxxx>]

At 2013-07-15 18:55 +0000, Costello, Roger L. wrote:
> The item of interest, however, is this snippet:
>
>             <xsl:for-each select="/bk:BookStore/bk:Book">
>                 <xsl:if test="data(bk:ISBN) instance of bk:ISBN-type">
>                     <ISBN><xsl:value-of select="bk:ISBN"/></ISBN>
>                 </xsl:if>
>             </xsl:for-each>
>
> The for-loop iterates through each Book and checks to see if the 
> value of its ISBN element conforms to ISBN-type; if it doesn't 
> conform, then it skips that ISBN and goes to the next Book.
>
> In the XML document shown above, the Book element has an ISBN 
> (xxx1-56592-235-2) that is not valid, so I expect my XSLT program to skip it.
>
> However, that is not happening. I get this error message:
>
>     The content "xxx1-56592-235-2" of element <ISBN> does not
>     match the required simple type. Value "xxx1-56592-235-2"
>     contravenes the pattern facet "\d{1}-\d{5}-\d{3}-\d{1}|\d{1}-..."
>     of the type ISBN-type

Yep!  Because I think you are taking one step too far.  I haven't 
tested it, but I think this will work for you:

   test="string(bk:ISBN) instance of bk:ISBN-type">

> What am I doing wrong please?

You are enforcing the schema constraint by using data() before 
checking that the content conforms to the constraint.  In my code I'm 
simply getting the value as a string, thus not imposing any 
constrains, and then checking that string to be convertible to the 
said constraints.

Please let me know if that works for you.

I hope it helps.

. . . . . . . Ken

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