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Previously we were using the SQL:2003 definition, which doesn't allow this, but that creates a serious dump/restore gotcha: there is no setting of xmloption that will allow all valid XML data. Hence, switch to the 2006 definition. Since libxml doesn't accept <!DOCTYPE> directives in the mode we use for CONTENT parsing, the implementation is to detect <!DOCTYPE> in the input and switch to DOCUMENT parsing mode. This should not cost much, because <!DOCTYPE> should be close to the front of the input if it's there at all. It's possible that this causes the error messages for malformed input to be slightly different than they were before, if said input includes <!DOCTYPE>; but that does not seem like a big problem. In passing, buy back a few cycles in parsing of large XML documents by not doing strlen() of the whole input in parse_xml_decl(). Back-patch because dump/restore failures are not nice. This change shouldn't break any cases that worked before, so it seems safe to back-patch. Chapman Flack (revised a bit by me) Discussion: https://postgr.es/m/CAN-V+g-6JqUQEQZ55Q3toXEN6d5Ez5uvzL4VR+8KtvJKj31taw@mail.gmail.com |
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Documentation concerning how to run these regression tests and interpret the results can be found in the PostgreSQL manual, in the chapter "Regression Tests".