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This function is unreferenced in modern usage; it was superseded in 9.1 by a core function of the same name.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
The PostgreSQL contrib tree
---------------------------
This subtree contains porting tools, analysis utilities, and plug-in
features that are not part of the core PostgreSQL system, mainly
because they address a limited audience or are too experimental to be
part of the main source tree. This does not preclude their
usefulness.
User documentation for each module appears in the main SGML
documentation.
When building from the source distribution, these modules are not
built automatically, unless you build the "world" target. You can
also build and install them all by running "make all" and "make
install" in this directory; or to build and install just one selected
module, do the same in that module's subdirectory.
Some directories supply new user-defined functions, operators, or
types. To make use of one of these modules, after you have installed
the code you need to register the new SQL objects in the database
system by executing a CREATE EXTENSION command. In a fresh database,
you can simply do
CREATE EXTENSION module_name;
See the PostgreSQL documentation for more information about this
procedure.