Hello @AndreP
I couldn’t avoid to give it a try. I can visualized two possible solutions to your challenge:
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The first one would be an upgrade of your solution; by using recursive loop. But you already worked out by yourself.
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The alternative solution is the one that I consider more interesting, as it explores KNIME nodes functions and format properties. It is based in Tagging and Replace of Document format, avoiding loop iterations. I’ve prepared a workflow example for your use case.
Please share your thoughts about.
BR