IsSimpleIsSimple test This service shall return a true value if and only if geometry g has no anomalous geometric points, such as self intersection or self tangency. Simple curves intersect themselves only at their endpoints (only if they are also closed, see next function).urn:ogc:wps:1.0.0:unionInputPolygonthe first geometry the first geometry to compare against.text/xmlUTF-8http://fooa/gml/3.1.0/polygon.xsdtext/xmlbase64http://fooa/gml/3.1.0/polygon.xsd