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<?xml version="1.0" encoding="ISO-8859-1"?>
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<refentry id="fn_ST_ExteriorRing">
<refmeta>
<refentrytitle>ST_ExteriorRing</refentrytitle>
<refmiscinfo>geo</refmiscinfo>
</refmeta>
<refnamediv>
<refname>ST_ExteriorRing</refname>
<refpurpose>Returns an external (the very first) ring of a polygon.</refpurpose>
</refnamediv>
<refsynopsisdiv>
<funcsynopsis id="fsyn_ST_ExteriorRing">
<funcprototype id="fproto_ST_ExteriorRing">
<funcdef><function>ST_ExteriorRing</function></funcdef>
<paramdef>in <parameter>poligon</parameter> any</paramdef>
</funcprototype>
</funcsynopsis>
</refsynopsisdiv>
<refsect1 id="desc_ST_ExteriorRing">
<title>Description</title>
<para>Returns an external (the very first) ring of a polygon. </para>
</refsect1>
<refsect1 id="params_ST_ExteriorRing">
<title>Parameters</title>
<refsect2><title>poligon</title><para>A given poligon from a type shape.</para></refsect2>
</refsect1>
<refsect1 id="ret_ST_ExteriorRing"><title>Return Types</title>
<para>Returns any.</para>
</refsect1>
<refsect1 id="examples_ST_ExteriorRing">
<title>Examples</title>
<example id="ex_ST_ExteriorRing"><title>Simple Use</title>
<screen><![CDATA[
SQL> select ST_ExteriorRing (st_ewkt_read ('POLYGON((1 3,2 4,1 5,0 4,1 3),(1 3.5,1.5 4,1 4.5,0.5 4,1 3.5))'))
_______________________________________________________________________________
RING(1.0 3.0,2.0 4.0,1.0 5.0,0.0 4.0,1.0 3.0)
]]>
</screen>
</example>
</refsect1>
<refsect1 id="seealso_ST_ExteriorRing">
<title>See Also</title>
<para><link linkend="fn_ST_InteriorRingN"><function>ST_InteriorRingN()</function></link></para>
<para><link linkend="fn_ST_NumInteriorRings"><function>ST_NumInteriorRings()</function></link></para>
<para><link linkend="fn_st_point"><function>st_point</function></link></para>
<para><link linkend="fn_st_x"><function>st_x</function></link></para>
<para><link linkend="fn_st_y"><function>st_y</function></link></para>
<para><link linkend="fn_ST_Z"><function>ST_Z</function></link></para>
<para><link linkend="fn_st_distance"><function>st_distance</function></link></para>
<para><link linkend="fn_ST_SetSRID"><function>ST_SetSRID</function></link></para>
<para><link linkend="fn_st_astext"><function>st_astext</function></link></para>
<para><link linkend="fn_st_geomfromtext"><function>st_geomfromtext</function></link></para>
<para><link linkend="fn_st_intersects"><function>st_intersects</function></link></para>
<para><link linkend="fn_st_contains"><function>st_contains</function></link></para>
<para><link linkend="fn_st_within"><function>st_within</function></link></para>
<para><link linkend="fn_isgeometry"><function>isgeometry</function></link></para>
<para><link linkend="fn_geo_insert"><function>geo_insert</function></link></para>
<para><link linkend="fn_geo_delete"><function>geo_delete</function></link></para>
<para><link linkend="fn_rdf_geo_add"><function>DB.DBA.RDF_GEO_ADD</function></link></para>
<para><link linkend="fn_rdf_geo_fill"><function>DB.DBA.RDF_GEO_FILL</function></link></para>
</refsect1>
</refentry>
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