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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
PostgreSQL Database Management System ===================================== This directory contains the source code distribution of the PostgreSQL database management system. PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings. PostgreSQL has many language interfaces, many of which are listed here: https://www.postgresql.org/download See the file INSTALL for instructions on how to build and install PostgreSQL. That file also lists supported operating systems and hardware platforms and contains information regarding any other software packages that are required to build or run the PostgreSQL system. Copyright and license information can be found in the file COPYRIGHT. A comprehensive documentation set is included in this distribution; it can be read as described in the installation instructions. The latest version of this software may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.