I agree but

> it should not be impossible

Not many things are really fully impossible, but from my experience freedom of interpretation is a really bad start for a question and subsequent algorithm.

Especially if "possibility" must be bought with runtime overhead.

edit

This has the smell of NP completeness. *

Cheers Rolf
(addicted to the Perl Programming Language and ☆☆☆☆ :)
Je suis Charlie!

update

*) reminds me of Subgraph_isomorphism_problem

In reply to Re^5: Create JSON patch (updated) by LanX
in thread Create JSON patch by Anonymous Monk

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