I typically do following steps in such situation:

1. Write the simplest code to product the same effect (warning in your case). You would exactly know which part of the code warns you.

2. Write the simplest data to product the same effect. Perhaps one element with deepish descendants could proof your idea.

In reply to Re^3: Deep recursion error using LibXML by pajout
in thread Deep recursion error using LibXML by mertserger

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