I need to execute XML transformation on some .xml files based on untagged text contained in specific tag. The problem is that although the untagged text is constant, the “activity” node name can vary. Thus, I cannot rely on activity node name, rather I can only rely on the untagged text in the specific tag. The untagged text that I should look for and then replace is:

%%some/Global%%

And the tree of the tags will be always constant and look like this:
ProcessDefinition/activity[name that varies]/config/endpointURL/

If I match this combination of tag tree and untagged text, then and only then I should replace the untagged text to:

%%new/Code%%

And add the ssl block under the endpointURL tag(in the config block):

<ns999:ssl xmlns:ns999="http://some/xmlns/target">
    <ns999:strongCipherSuitesOnly>true</ns999:strongCipherSuitesOnly>
    <ns999:cert isRef="true">/.folder</ns999:cert>
</ns999:ssl>

In general speaking …

The input:

<pd:ProcessDefinition xmlns:pfx6="SOME DATA HERE">
    <pd:activity name="THIS NAME VARIES FROM EACH PROJECT TO PROJECT">
        <pd:x>00</pd:x>
        <pd:y>00</pd:y>
        <config>
            <endpointURL>%%some/Global%%</endpointURL>
        </config>
        <pd:inputBindings>
            SOME UNIMPORTANT DATA
        </pd:inputBindings>
    </pd:activity>
</pd:ProcessDefinition>

The desired output:

<pd:ProcessDefinition xmlns:pfx6="SOME DATA HERE">
    <pd:activity name="THIS NAME VARIES FROM EACH PROJECT TO PROJECT">
        <pd:x>00</pd:x>
        <pd:y>00</pd:y>
        <config>
            <endpointURL>%%new/Code%%</endpointURL>
            <ns999:ssl xmlns:ns999="http://some/xmlns/target">
                <ns999:strongCipherSuitesOnly>true</ns999:strongCipherSuitesOnly>
                <ns999:cert isRef="true">/.folder</ns999:cert>
            </ns999:ssl>
        </config>
        <pd:inputBindings>
            SOME UNIMPORTANT DATA
        </pd:inputBindings>
    </pd:activity>
</pd:ProcessDefinition>

I have tried the following:

<xsl:stylesheet version="1.0" 
    xmlns:xsl="http://www.w3.org/1999/XSL/Transform" 
    xmlns:ns999="http://some/xmlns/test_2"
    xmlns="http://some/xmlns/test_1" 
    xmlns:tc="http://some/xmlns/test_1" exclude-result-prefixes="tc">
    <xsl:output method="xml" indent="yes"/>
    
    <xsl:template match="node()|@*">
        <xsl:copy>
            <xsl:apply-templates select="node()|@*"/>
        </xsl:copy>
    </xsl:template>
    
    <xsl:template match="endpointURL">
        <xsl:copy>
            <xsl:apply-templates select="node()|@*"/>
            <ns999:ssl xmlns:ns999="http://some/xmlns/target">
                <ns999:strongCipherSuitesOnly>true</ns999:strongCipherSuitesOnly>
                <ns999:cert isRef="true">/.folder</ns999:cert>
            </ns999:ssl>
        </xsl:copy>
    </xsl:template>
</xsl:stylesheet>

I cannot find how to filter the endpointURL by untagged text %%some/Global%%?
And, if the ssl node injection will be in the right place after that tag?

Please, any help would be appreciated.