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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
-
-->
<refentry id="fn_isref">
<refmeta>
<refentrytitle>IsRef</refentrytitle>
<refmiscinfo>rdf</refmiscinfo>
</refmeta>
<refnamediv>
<refname>IsRef</refname>
<refpurpose>Returns true if non-blank IRI</refpurpose>
</refnamediv>
<refsynopsisdiv>
<funcsynopsis id="fsyn_isref">
<funcprototype id="fproto_isref">
<funcdef><function>IsRef</function></funcdef>
<paramdef>in <parameter>iri</parameter> any</paramdef>
</funcprototype>
</funcsynopsis>
</refsynopsisdiv>
<refsect1 id="desc_isref">
<title>Description</title>
<para>Returns true if non-blank IRI</para>
</refsect1>
<refsect1 id="params_isref">
<title>Parameters</title>
<refsect2><title>iri</title>
<para>IRI resource</para>
</refsect2>
</refsect1>
<refsect1 id="ret_isref"><title>Return Types</title>
<para>Returns 1 if the IRI is non-blank IRI. Otherwise returns 0.</para>
</refsect1>
<refsect1 id="examples_isref">
<title>Examples</title>
<example id="ex_isref"><title>Simple example</title>
<programlisting><![CDATA[
SQL>SPARQL
SELECT COUNT(DISTINCT (?o))
WHERE
{
?s ?p ?o .
FILTER ( IsRef(?o))
}
LIMIT 10
callret-0
76027
]]></programlisting>
</example>
</refsect1>
<refsect1 id="seealso_isref">
<title>See Also</title>
<para><link linkend="fn_rdf_audit_metadata"><function>DB.DBA.RDF_AUDIT_METADATA</function></link></para>
<para><link linkend="fn_rdf_backup_metadata"><function>DB.DBA.RDF_BACKUP_METADATA</function></link></para>
<para><link linkend="fn_rdf_load_rdfxml"><function>DB.DBA.RDF_LOAD_RDFXML</function></link></para>
<para><link linkend="fn_rdf_load_rdfxml_mt"><function>DB.DBA.RDF_LOAD_RDFXML_MT</function></link></para>
</refsect1>
</refentry>
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