update xsl file with xmlstaret, grep or similar - xslt

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>

Answer 2

In a POSIX shell the following xmlstarlet command:
xmlstarlet edit \
-N xsl="http://www.w3.org/1999/XSL/Transform" \
-N mdb="urn:so70244776_mdb" \
-N mrd="urn:so70244776_mrd" \
--var templatename "'distributor-N.xsl'" \
--var anchornode '//mrd:distributionFormat[1]' \
-d '$anchornode/following-sibling::xsl:call-template' \
-a '$anchornode' -t elem -n 'xsl:call-template' -v '' \
-a '$xstar:prev' -t attr -n name -v '' \
-u '$xstar:prev' -x '$templatename' \
main.xsl
declares a number of namespace bindings
selects //mrd:distributionFormat[1] as anchor node
deletes any existing xsl:call-template sibling nodes following the anchor
appends a new xsl:call-template element with a name attribute
xmlstarlet edit code can use the convenience $xstar:prev (aka
$prev) node to refer to the node created by the most recent
-i / --insert, -a / --append, or -s / --subnode option.
Examples of $xstar:prev are given in
doc/xmlstarlet.txt
and the source code's examples/ed-backref*.
In the command shown its first use refers to the xsl:call-template
element, the second to the name attribute.
EDIT: It turns out xmlstarlet edit isn't as picky as I thought
it was so an alternative, shorter command would be (attribute nodes
can be added with -s, -i, or -a):
xmlstarlet edit \
--var anchor '//mrd:distributionFormat[1]' \
-d '$anchor/following-sibling::xsl:call-template' \
-a '$anchor' -t elem -n 'xsl:call-template' -v '' \
-s '$prev' -t attr -n name -v 'distributor-N.xsl' \
main.xsl
Given the following (demo) input:
<?xml version="1.0" encoding="UTF-8"?>
<xsl:transform version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:mdb="urn:so70244776_mdb"
xmlns:mrd="urn:so70244776_mrd"
>
<xsl:template name="q">
<mdb:distributionInfo>
<mrd:MD_Distribution>
<mrd:distributionFormat>
<mrd:MD_Format>
<mrd:formatSpecificationCitation/>
</mrd:MD_Format>
</mrd:distributionFormat>
<xsl:call-template name="distributor.xsl"/>
<!-- x -->
<xsl:call-template name="distributor-1.xsl"/>
<mrd:transferOptions/>
</mrd:MD_Distribution>
</mdb:distributionInfo>
</xsl:template>
</xsl:transform>
either command above produces the following output:
<?xml version="1.0" encoding="UTF-8"?>
<xsl:transform xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:mdb="urn:so70244776_mdb" xmlns:mrd="urn:so70244776_mrd" version="1.0">
<xsl:template name="q">
<mdb:distributionInfo>
<mrd:MD_Distribution>
<mrd:distributionFormat>
<mrd:MD_Format>
<mrd:formatSpecificationCitation/>
</mrd:MD_Format>
</mrd:distributionFormat>
<xsl:call-template name="distributor-N.xsl"/>
<!-- x -->
<mrd:transferOptions/>
</mrd:MD_Distribution>
</mdb:distributionInfo>
</xsl:template>
</xsl:transform>