The first thing would be to actually extract your $ssrids from the XML and print them.
Then, extract the system IDs from the other XML and print those.
After you have convinced yourself that you can extract the correct values, apply the hint of how to find matching elements between two lists.
Maybe you need to take a step back and consider whether/how you can actually extract the data you need.
In reply to Re^3: Compare 2 XML files
by Corion
in thread Compare 2 XML files
by snehit.ar
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