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The default for the choice attribute of the <arg> element is "opt", which would normally put the argument inside brackets. But the DSSSL stylesheets contain a hack that treats <arg> directly inside <group> specially, so that <group><arg>-x</arg><arg>-y</arg></group> comes out as [ -x | -y ] rather than [ [-x] | [-y] ], which it would technically be. But when building man pages, this doesn't work, and so the command synopses on the man pages contain lots of extra brackets. By putting choice="opt" or choice="plain" explicitly on every <arg> and <group> element, we avoid any toolchain dependencies like that, and it also makes it clearer in the source code what is meant. In passing, make some small corrections in the documentation about which arguments are really optional or not.
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: http://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. Changes between all PostgreSQL releases are recorded in the file HISTORY. 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 http://www.postgresql.org/download/. For more information look at our web site located at http://www.postgresql.org/.