Example exploding a compoundcurve, also reference to ST_GeometryN since they serve...

git-svn-id: http://svn.osgeo.org/postgis/trunk@4085 b70326c6-7e19-0410-871a-916f4a2858ee

diff --git a/doc/reference.xml b/doc/reference.xml
index c8e73a87dd8da8e18781a1f91ba9b8957938eb83..68180634448563e74934f8f0f4a78dfc5d6bd95b 100644 (file)
--- a/doc/reference.xml
+++ b/doc/reference.xml
@@ -7429,12 +7429,12 @@ st_asgeojson
                st_asgml
                --------
                <gml:Polygon srsName="EPSG:4326"><gml:outerBoundaryIs><gml:LinearRing><gml:coordinates>0,0 0,1 1,1 1,0 0,0</gml:coordinates></gml:LinearRing></gml:outerBoundaryIs></gml:Polygon>]]>
-               </programlisting>
+                       </programlisting>
                <programlisting><![CDATA[SELECT ST_AsGML(3, ST_GeomFromText('POINT(5.234234233242 6.34534534534)',4326), 5, 17);
-               st_asgml                                                    
-               --------
+                       st_asgml
+                       --------
                <gml:Point srsName="urn:ogc:def:crs:EPSG:4326"><gml:pos>6.34535 5.23423</gml:pos></gml:Point>]]>
-               </programlisting>
+                       </programlisting>
 
          </refsection>
        </refentry>
@@ -11994,11 +11994,25 @@ MULTIPOINT(-118.6 38.329 6,-118.58 38.38 5)
                <title>Examples</title>
        <programlisting>SELECT sometable.field1, sometable.field1,
          (ST_Dump(sometable.the_geom)).geom As the_geom
-FROM sometable</programlisting>
+FROM sometable;
+
+--Break a compound curve into its constituent linestrings and circularstrings
+SELECT ST_AsEWKT(a.geom), ST_HasArc(a.geom)
+  FROM ( SELECT (ST_Dump(p_geom)).geom as geom
+                  FROM (SELECT ST_GeomFromEWKT('COMPOUNDCURVE(CIRCULARSTRING(0 0, 1 1, 1 0),(1 0, 0 1))') as p_geom) as b
+          ) as a;
+                 st_asewkt          | st_hasarc
+-----------------------------+----------
+ CIRCULARSTRING(0 0,1 1,1 0) | t
+ LINESTRING(1 0,0 1)         | f
+(2 rows)
+
+
+</programlisting>
          </refsection>
          <refsection>
                <title>See Also</title>
-               <para><xref linkend="ST_Collect" /></para>
+               <para><xref linkend="ST_Collect" />, <xref linkend="ST_GeometryN" /></para>
          </refsection>
        </refentry>