I can’t find out how to add a DTD (internal subset) to a document without 
poking into libxml2’s internal data structures. The obvious approach is to add 
a xmlDtdPtr using 
xmlAddPrevSibling on the document root. But this will cause a memory leak 
because xmlFreeDoc won’t free the DTD nodes. It only frees the DTDs pointed to 
by doc->intSubset and doc->extSubset. So do I have to deal with these struct 
members manually or is there a better way?

Nick

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