update xsl file with xmlstaret, grep or similar

Question

I have a series of similar XSL files and to all of them, I have to add the same XSL element in a specific position.

Here you can find a portion of the XSL to be updated and the element to be inserted is <xsl:call-template name="distributor.xsl"/> and it has to be after the </mrd:distributionFormat> and before the <mrd:transferOptions> tags

Is there a way to automatize this update to all my XSL files using XmlStarlet grep or similar?

...
<mdb:distributionInfo>
      <mrd:MD_Distribution>
         <mrd:distributionFormat>
            <mrd:MD_Format>
               <mrd:formatSpecificationCitation>
                  <cit:CI_Citation>
                     <cit:title>
                        <gco:CharacterString>WCS</gco:CharacterString>
                     </cit:title>
                     <cit:date gco:nilReason="unknown"/>
                     <cit:edition>
                        <gco:CharacterString>2.0</gco:CharacterString>
                     </cit:edition>
                  </cit:CI_Citation>
               </mrd:formatSpecificationCitation>
            </mrd:MD_Format>
         </mrd:distributionFormat>
                 <!-- call-template  -->           
                <xsl:call-template name="distributor.xsl"/>
                 <!-- call-template -->
         <mrd:transferOptions>
         ...

I tried with

xmlstarlet ed -P -S -L -s //mrd:MD_Distribution -t elem -i xsl:include -t attr -n "name" -v "distributor.xsl" main.xsl where main.xsl is the file to be updated

Answer 1

After changed requirements

Following commmand inserts the desired xsl:call-template node where you want (for details see my first posting),

xmlstarlet edit \
    -i '//mrd:transferOptions[1]' \
    -t elem -n 'xsl:call-template' -v '' \
    -s '$prev' -t attr -n name -v 'distributor.xsl' \
main.xsl

when run on the following XML file (adjust namespaces as needed):

<xsl:transform version="1.0"
  xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
  xmlns:cit="urn:so70244776_cit"
  xmlns:gco="urn:so70244776_gco"
  xmlns:mdb="urn:so70244776_mdb"
  xmlns:mrd="urn:so70244776_mrd"
>
  <xsl:template name="x">
    <mdb:distributionInfo>
        <mrd:MD_Distribution>
           <mrd:distributionFormat>
              <mrd:MD_Format>
                 <mrd:formatSpecificationCitation>
                    <cit:CI_Citation>
                       <cit:title>
                          <gco:CharacterString>WCS</gco:CharacterString>
                       </cit:title>
                       <cit:date gco:nilReason="unknown"/>
                       <cit:edition>
                          <gco:CharacterString>2.0</gco:CharacterString>
                       </cit:edition>
                    </cit:CI_Citation>
                 </mrd:formatSpecificationCitation>
              </mrd:MD_Format>
           </mrd:distributionFormat>
           <mrd:transferOptions/>
        </mrd:MD_Distribution>
    </mdb:distributionInfo>
  </xsl:template>

</xsl:transform>