Re: how to assign part of an attributes value to anoth

your stylesheet specified version="2.0" so I assume you are using an
xslt 2 system, in which case you have regexp available

    <xsl:template match="ptr[@target|@n]">
        <ptr target="{@target}" n="{replace(@target,'abc\.07\.7\.([0-9]+)[tf]m','$1')}"/>
    </xsl:template>

otherwise if you are using xslt 1 then

    <xsl:template match="ptr[@target|@n]">
        <ptr target="{@target}" n="{translate(substring(@target,10),'tfm','')}"/>
    </xsl:template>

David

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