Re: Use of data() function

On 04/03/2008, Michael Kay <mike@xxxxxxxxxxxx> wrote:
>  > I don't think most doc-heads would accept as valid the idea
>  > that a mixed content element (especially if the element has
>  > the mixed content in it) is of type string.
>  >
>
> of course, and it isn't of type string. But if you atomize it you get an
>  untypedAtomic value which can be used anywhere you might use a string.

Here's a standalone transform to demonstrate the issue:

<xsl:stylesheet
    xmlns:xs="http://www.w3.org/2001/XMLSchema"
    xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="2.0">

    <xsl:import-schema>
        <xs:schema>
            <xs:element name="person" type="person"/>

            <xs:complexType name="person">
                <xs:sequence>
                    <xs:element name="surname"/>
                    <xs:element name="name"/>
                </xs:sequence>
            </xs:complexType>
        </xs:schema>
    </xsl:import-schema>

    <xsl:variable name="input">
        <person xsl:type="person">
            <surname>bloggs</surname>
            <name>joe</name>
        </person>
    </xsl:variable>

    <xsl:template match="/" name="main">
        <xsl:value-of select="data($input/person)"/>
    </xsl:template>

</xsl:stylesheet>

The input is validated and the <person> element is typed as "person"
according to the embedded schema.

Calling data($input/person) results in the error:

"Cannot get the typed value of an element with element-only content"

If the schema is modified to give person mixed content:

<xs:complexType name="person" mixed="true">

and then you re-run the transform after making just that one small
change, you get this:

bloggsjoe

...which is a bit odd to me at the moment.  It seems a bit of an
artificial restriction.


cheers
-- 
Andrew Welch
http://andrewjwelch.com
Kernow: http://kernowforsaxon.sf.net/