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Calling xslt template with param tag by pran sukh on Python Hunter

In XSLT we may need to use same template for different xml data tags, and also there might be a situation where we need to send some special instructions to template tag to act upon give condition or value and produce/process the xml data.

Data.xml
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<?xml version='1.0'?>
<?xml-stylesheet type="text/xsl" href="XSLT.xsl"?>
<lists>
   <ol>
      <li>the</li>
      <li>cat</li>
      <ol>
         <li>sat</li>
         <li>on</li>
         <li>the</li>
      </ol>
      <li>mat</li>
   </ol>
</lists>


XSLT.xsl

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<?xml version='1.0'?>
<xsl:stylesheet version="1.0"
      xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
      xmlns:fo="http://www.w3.org/1999/XSL/Format">
   
<!-- Calling template from here without any parameter -->
<xsl:template match="ol/li">
   <br/>
   <xsl:call-template name="numbered-block"/>
</xsl:template>

<!-- Calling template from here with "format" parameter -->
<xsl:template match="ol/ol/li">
   <br/>&#xA0;&#xA0;&#xA0;
   <xsl:call-template name="numbered-block">
      <xsl:with-param name="format">a ) </xsl:with-param>
   </xsl:call-template>
</xsl:template>

<!-- Calling template here -->
<xsl:template name="numbered-block">
<!--Calling this template without any parameter then format 1. will be shown on browser. -->
   <xsl:param name="format">1. </xsl:param>
   
   <fo:block>
   <!--Calling this template with a parameter then this format will be shown on browser. {$format} is used to catch the incoming format value, in this case the value is "a ) "-->
      <xsl:number format="{$format}"/>
      <xsl:apply-templates/>
   </fo:block>
   
</xsl:template>

</xsl:stylesheet>

Explanation:-

 <xsl:template match="ol/li"> tag in XSLT is calling the 

 <xsl:template name="numbered-block"> without any parameter in it so when the matching template is fetched then 
<xsl:param name="format">1. </xsl:param> is set and used for that template. 

 When same template is called with 
<xsl:with-param name="format">a ) </xsl:with-param> then any local parameter in it with same name will be ignored, like format parameter is being passes with value "a." then local param in <template name="numbered-block"> tag  with value as <xsl:param name="format">1. </xsl:param> is being ignored.

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