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This function is unreferenced in modern usage; it was superseded in 9.1 by a core function of the same name. It has been left in place in the C code only so that pre-9.1 SQL definitions of the contrib/xml2 functions would continue to work. Eleven years seems like enough time for people to have updated to the extension-style version of the xml2 module, so let's drop this. We did this once before, in 20540710e, and then reverted it because the intended change of PGDLLEXPORT markings didn't happen. This time the reason is to suppress link-time duplicate-symbol warnings on AIX. That's not worth a lot perhaps, but the value of keeping this function has surely dropped to about zero by now. Discussion: https://postgr.es/m/2717731.1644778752@sss.pgh.pa.us