Here is synopsis for 'xml tr' command:

XMLStarlet Toolkit: Transform XML document(s) using XSLT
Usage: xml tr [<options>] <xsl-file> {-p|-s <name>=<value>} [ <xml-file-or-uri> ... ]
where
   <xsl-file>      - main XSLT stylesheet for transformation
   <xml-file>      - input XML document file name (stdin is used if missing)
   <name>=<value>  - name and value of the parameter passed to XSLT processor
   -p              - parameter is XPATH expression ("'string'" to quote string)
   -s              - parameter is a string literal
<options> are:
   --omit-decl     - omit xml declaration <?xml version="1.0"?>
   --show-ext      - show list of extensions
   --val           - allow validate against DTDs or schemas
   --net           - allow fetch DTDs or entities over network
   --xinclude      - do XInclude processing on document input
   --maxdepth val  - increase the maximum depth
   --html          - input document(s) is(are) in HTML format
   --catalogs      - use SGML catalogs from $SGML_CATALOG_FILES
                     otherwise XML catalogs starting from
                     file:///etc/xml/catalog are activated by default

XMLStarlet is a command line toolkit to query/edit/check/transform
XML documents (for more information see http://xmlstar.sourceforge.net/)

Current implementation uses libxslt from GNOME codebase as XSLT processor
(see http://xmlsoft.org/ for more details)

EXAMPLE:

# Transform passing parameters to XSLT stylesheet
xml tr xsl/param1.xsl -p Count='count(/xml/table/rec)' -s Text="Count=" xml/table.xml

Input xsl/params1.xsl

<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="text"/>
<xsl:param name="Text"/>
<xsl:param name="Count"/>
<xsl:template match="/">
  <xsl:call-template name="t1"/>
</xsl:template>
<xsl:template name="t1">
  <xsl:for-each select="/xml">
    <xsl:value-of select="$Text"/>
    <xsl:value-of select="$Count"/>
    <xsl:value-of select="'&#10;'"/>
  </xsl:for-each>
</xsl:template>
</xsl:stylesheet>

Output

Count=3