Re: [xsl] Returning a value from a template

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

At 2010-11-09 18:07 -0800, Narayan wrote:
> I have been scratching my head on how to return a value from a called template
> which includes a for loop. A snippet of the XML fragment is as follows:
>
>  <Loop-N1>
>       <Segment-N1>
>          <Element-98>BT</Element-98>
>          <Element-93 xsi:nil="true"/>
>          <Element-66>21</Element-66>
>          <Element-67>RA0129937</Element-67>
>       </Segment-N1>
>    </Loop-N1>
>    <Loop-N1>
>       <Segment-N1>
>          <Element-98>ST</Element-98>
>          <Element-93>ABC COLUMBUS DIVISION</Element-93>
>          <Element-66>11</Element-66>
>          <Element-67>RA0314562</Element-67>
>       </Segment-N1>
>    </Loop-N1>
>
> The element <Loop-N1> can occur multiple times. If one of the <Element-66>'s
> contain a value of "21" then I need to generate a fixed string value 
> else I need
> to generate another fixed string literal. So I tried creating a named template
> and calling this from my main template like a function:
>
>    <xsl:template name="getOrderSource">
>
>     <xsl:for-each select="/ns0:Transaction-850/ns0:Loop-N1">
>         <xsl:if test='ns0:Segment-N1/ns0:Element-66 = "21"'>
>           <xsl:variable name="ordrSrc" select="NAEDI"/>
>         </xsl:if>
>     </xsl:for-each>
>
>     <xsl:choose>
>       <xsl:when test='$orderSrc = "NAEDI"'>
>         <xsl:text disable-output-escaping="no">NAEDI</xsl:text>
>       </xsl:when>
>       <xsl:otherwise>
>         <xsl:text disable-output-escaping="no">NAEDIBrokerage</xsl:text>

(the default for d-o-e is "no" so you don't have to say it)

>       </xsl:otherwise>
>     </xsl:choose>
>   </xsl:template>
>
> This was called like:
>   <corecom:ID>
>             <xsl:call-template name="getOrderSource"/>
>   </corecom:ID>
>
>
> However, I realized that the variable declared inside the for-each is not
> visible to the xsl:choose that follows.

Right.  The scope of a local variable is the following siblings and 
their descendants.  There are no such following siblings.

> What I was trying to do is to set a flag
> to indicate that the element exists and then return the appropriate string
> literal. Would there be a simpler way to do this?

Yes ... don't use the flag.  Something along the lines of:

  <xsl:template name="getOrderSource">
    <xsl:for-each select="/ns0:Transaction-850/ns0:Loop-N1">
      <xsl:choose>
        <xsl:when test='ns0:Segment-N1/ns0:Element-66 = "21"'>NAEDI</xsl:when>
        <xsl:otherwise>NAEDIBrokerage</xsl:otherwise>
      </xsl:choose>
    </xsl:for-each>
  </xsl:template>

I hope this helps.

. . . . . . . Ken

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