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<?xml version="1.0" encoding="ISO-8859-1"?>
<!--
-
- This file is part of the OpenLink Software Virtuoso Open-Source (VOS)
- project.
-
- Copyright (C) 1998-2018 OpenLink Software
-
- This project is free software; you can redistribute it and/or modify it
- under the terms of the GNU General Public License as published by the
- Free Software Foundation; only version 2 of the License, dated June 1991.
-
- This program is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- General Public License for more details.
-
- You should have received a copy of the GNU General Public License along
- with this program; if not, write to the Free Software Foundation, Inc.,
- 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
-
-
-->
<!--
Please use the following prefixes for IDs:
xpf_ for old XPATH functions,
xf_ for XPATH 2.0 & XQUERY 1.0 functions,
xsl_ for XSL elements,
-->
<refentry id="xpf_except">
<refmeta>
<refentrytitle>except</refentrytitle>
<refmiscinfo>XPATH</refmiscinfo>
</refmeta>
<refnamediv>
<refname>except</refname>
<refpurpose>Returns a difference of two sets</refpurpose>
</refnamediv>
<refsynopsisdiv>
<funcsynopsis id="xpf_syn_except">
<funcprototype id="xpf_proto_except">
<funcdef>sequence <function>except</function></funcdef>
<paramdef><parameter>set1</parameter> sequence</paramdef>
<paramdef><parameter>set2</parameter> sequence</paramdef>
</funcprototype>
</funcsynopsis>
</refsynopsisdiv>
<refsect1 id="xpf_desc_except"><title>Description</title><para>The function returns an unordered sequence that consists of all distinct items from the first sequence that are missing in the second sequence.</para>
<para>Duplicate values from <parameter>set1</parameter> are removed, the decision whether two values duplicate each other is made according rules used by
<link linkend="xpf_distinct"><function>distinct()</function></link> function.</para>
</refsect1>
<refsect1 id="xpf_params_except"><title>Parameters</title>
<refsect2><title>set1</title>
<para>Sequence that contains items that can occur in the resulting set.</para></refsect2>
<refsect2><title>set2</title>
<para>Sequence that contains items that can not occur in the resulting set.</para></refsect2>
</refsect1>
<refsect1 id="xpf_ret_except"><title>Return Types</title><para>The function returns an unordered sequence of distinct values.</para></refsect1>
<!--
<refsect1 id="xpf_errors_except"><title>Errors</title>
<table><title>Errors signalled by</title>
<tgroup cols="4">
<thead><row><entry>SQLState</entry><entry>Error Code</entry><entry>Error Text</entry><entry>Description</entry></row></thead>
<tbody>
<row>
<entry><errorcode></errorcode></entry>
<entry><errorcode></errorcode></entry>
<entry><errorname></errorname></entry>
<entry></entry>
</row>
</tbody>
</tgroup>
</table>
</refsect1>
<refsect1 id="xpf_examples_except"><title>Examples</title>
<example id="xpf_ex_except"><title></title>
<para></para>
<screen></screen>
</example>
</refsect1>
-->
<refsect1 id="xpf_seealso_except"><title>See Also</title>
<para><link linkend="xpf_union"><function>union</function></link></para>
<para><link linkend="xpf_intersect"><function>intersect</function></link></para>
</refsect1>
</refentry>
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