Oxygen XML Forum

Posted: **Mon Mar 14, 2011 9:03 pm**

Hello,

I'm trying to understand regexes and variables.

I have an xml file:

<?xml version="1.0" encoding="UTF-8"?>

<addresses>

    <address>

        <addrLine2 class="sh12345678">some text 1</addrLine2>

        <addrLine2 class="history">some text 2</addrLine2>

        <addrLine2 class="sh">some text 3</addrLine2>

        <addrLine2 class="12345678">some text 4</addrLine2>

    </address>

</addresses>

and an xslt including:

Code: Select all

    <xsl:template match="addrLine2">

        <xsl:variable name="classValue" select="@class"/>



        <xsl:analyze-string select="$classValue" 

            regex="[a-zA-Z]{{2}}[0-9]+">

            

            <xsl:matching-substring>

                <addrLine2 class="{$classValue}"></addrLine2>

            </xsl:matching-substring>



            <xsl:non-matching-substring>

                <addrLine2 class=""></addrLine2>

            </xsl:non-matching-substring>            



        </xsl:analyze-string>

      

    </xsl:template>

I want the output to be:

Code: Select all

<addresses>

    <address>

        <addrLine2 class="sh12345678">some text 1</addrLine2>

        <addrLine2 class="">some text 2</addrLine2>

        <addrLine2 class="">some text 3</addrLine2>

        <addrLine2 class="">Lsome text 4</addrLine2>

    </address>

</addresses>

ie the class attribute is included when in the form wwdddddd but empty otherwise.

My xslt is producing:

Code: Select all

<addresses>

    <address>

        <addrLine2 class="sh12345678"/>

        <addrLine2 class=""/>

        <addrLine2 class=""/>

        <addrLine2 class=""/>

    </address>

</addresses>

But I can't get the addrLine2 "some text 1" etc to output. If I try
<addrLine2 class="{$classValue}"><xsl:apply-templates/></addrLine2>
I just get "Cannot apply-templates to child nodes when the context item is an atomic value".

Any help with this regex or variable (or whatever else it should be!) would be appreciated!

Thanks,

N

Posted: **Fri Mar 18, 2011 5:41 pm**

Hello,

The context inside the xsl:analyze-string is represented by its select, so in your case it's a string(the value of the class attribute).

Here's a quick solution. Keep the string match separate(use a named template to do it) when constructing the result document:

Code: Select all

    <xsl:template match="addrLine2">

        <xsl:element name="addrLine2">

            <xsl:attribute name="class">

                <xsl:call-template name="matchClassValue">

                    <xsl:with-param name="classValue" select="@class"/>

                </xsl:call-template>

            </xsl:attribute>

            <xsl:value-of select="text()"/>

        </xsl:element>

    </xsl:template>

    

    <xsl:template name="matchClassValue">

        <xsl:param name="classValue"/>

        <xsl:analyze-string select="$classValue" 

            regex="[a-zA-Z]{{2}}[0-9]+">

            

            <xsl:matching-substring>

                <xsl:value-of select="$classValue"/>

            </xsl:matching-substring>

        </xsl:analyze-string>

    </xsl:template>

Regards,
Adrian

Posted: **Mon Mar 21, 2011 6:23 pm**

Dear Adrian,

That's great - that's produced exactly what I wanted.

Thanks very much,

Natalie

Posted: **Mon Mar 21, 2011 7:01 pm**

Hi,

One thing from this I don't understand: you're using the variable $classValue in the named template but I don't see where this variable is declared. I expected to see <xsl:variable name="classValue" etc.

How is it possible to use the variable without first declaring it?

Thanks,

Natalie

Posted: **Mon Mar 21, 2011 7:05 pm**

Hi,

classValue is not a variable, it's a parameter of the template:

Code: Select all

<xsl:template name="matchClassValue">

  <xsl:param name="classValue"/>

...

Regards,
Adrian

Oxygen XML Forum

Cannot apply-templates to child nodes when the context item

Cannot apply-templates to child nodes when the context item

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Re: Cannot apply-templates to child nodes when the context item

Re: Cannot apply-templates to child nodes when the context item

Re: Cannot apply-templates to child nodes when the context item