OK, after 100 nodes later I have a reference table with all XML nodes I’m interested in. With a Joiner Node I compare the content of the actual XML file with the reference table. This look like this:
Now my idea is to tell my XPath Nodes via Flow Variables which XML column to select. In the shown case my specific Xpath node has to read in XML column “AdditionalServce(#58)” insted of “AdditionalServce(#62)” Does this the Tabel Column to Variable Node? If so the Flow Variable output table looks like this
my Workflow now looks like this and is very nested.
Going deep in the meta nodes the flow variable connection comes to the corresponding XPath node. Which switch do I need at this point? And I have the dull feeling that then I need this switch 60 times (for each XPAth node), right? 
Here is the Meta Node with the example XPath node to change the input column by flow variable
Hope anybody has a good idea for me.
Brotfahrer