<!-- $PostgreSQL: pgsql/doc/src/sgml/func.sgml,v 1.410 2007/11/05 17:40:21 tgl Exp $ -->

<!-- $PostgreSQL: pgsql/doc/src/sgml/func.sgml,v 1.411 2007/11/08 13:13:28 petere Exp $ -->

<chapter id="functions">

<title>Functions and Operators</title>

</para>

<para>

XML declarations, if present are combined as follows. If all

XML declarations, if present, are combined as follows. If all

argument values have the same XML version declaration, that

version is used in the result, else no version is used. If all

argument values have the standalone declaration value

Example:

<screen><![CDATA[

SELECT xpath('/my:a/text()', '<my:a xmlns:my="http://example.com">test</my:a>', ARRAY[ARRAY['my', 'http://example.com']]);

xpath

--------

{test}

<para>

<function>table_to_xml</function> maps the content of the named

table, passed as parameter <parameter>tbl</parameter>. The

<type>regclass</type> accepts strings identifying tables using the

<type>regclass</type>typeaccepts strings identifying tables using the

usual notation, including optional schema qualifications and

double quotes. <function>query_to_xml</function> executes the

query whose text is passed as parameter