The AbstractGeometry element is the abstract head of the substitution group forall geometry elements of GML. This includes pre-defined and user-defined geometry elements.Any geometry element shall be a direct or indirect extension/restriction ofAbstractGeometryType and shall be directly or indirectly in the substitution group ofAbstractGeometry.
Database handle for the object. It is of XML type ID, so is constrained to beunique in the XML document within which it occurs. An external identifier for the object inthe form of a URI may be constructed using standard XML and XPointer methods. This is doneby concatenating the URI for the document, a fragment separator, and the value of the idattribute.
<element name="AbstractGeometry" type="gml:AbstractGeometryType" abstract="true" substitutionGroup="gml:AbstractGML"><annotation><documentation>The AbstractGeometry element is the abstract head of the substitution group for all geometry elements of GML. This includes pre-defined and user-defined geometry elements. Any geometry element shall be a direct or indirect extension/restriction of AbstractGeometryType and shall be directly or indirectly in the substitution group of AbstractGeometry.</documentation></annotation></element>