The basic feature model is given by the gml:AbstractFeatureType. The contentmodel for gml:AbstractFeatureType adds two specific properties suitable for geographicfeatures to the content model defined in gml:AbstractGMLType. The value of the gml:boundedByproperty describes an envelope that encloses the entire feature instance, and is primarilyuseful for supporting rapid searching for features that occur in a particular location. Thevalue of the gml:location property describes the extent, position or relative location ofthe feature.
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.
Source
<complexType name="AbstractFeatureType" abstract="true"><annotation><documentation>The basic feature model is given by the gml:AbstractFeatureType. The content model for gml:AbstractFeatureType adds two specific properties suitable for geographic features to the content model defined in gml:AbstractGMLType. The value of the gml:boundedBy property describes an envelope that encloses the entire feature instance, and is primarily useful for supporting rapid searching for features that occur in a particular location. The value of the gml:location property describes the extent, position or relative location of the feature.</documentation></annotation><complexContent><extension base="gml:AbstractGMLType"><sequence><!-- DSB restricted from profile
<element ref="gml:boundedBy" minOccurs="0"/>
--></sequence></extension></complexContent></complexType>