feature.xsd v2.1.2 2002-07 GML Feature schema. Copyright (c) 2002 OGC, All Rights Reserved. An abstract feature provides a set of common properties. A concrete feature type must derive from this type and specify additional properties in an application schema. A feature may optionally possess an identifying attribute ('fid'). This abstract base type just makes the boundedBy element mandatory for a feature collection. A feature collection contains zero or more featureMember elements. A simple geometry property encapsulates a geometry element. Alternatively, it can function as a pointer (simple-type link) that refers to a remote geometry element. An instance of this type (e.g. a featureMember) can either enclose or point to a feature (or feature collection); this type can be restricted in an application schema to allow only specified features as valid participants in the association. When serving as a simple link that references a remote feature instance, the value of the gml:remoteSchema attribute can be used to locate a schema fragment that constrains the target instance. Bounding shapes--a Box or a null element are currently allowed. Encapsulates a single point to represent position, location, or centerOf properties. Encapsulates a single polygon to represent coverage or extentOf properties. Encapsulates a single LineString to represent centerLineOf or edgeOf properties. Encapsulates a MultiPoint element to represent the following discontiguous geometric properties: multiLocation, multiPosition, multiCenterOf. Encapsulates a MultiLineString element to represent the following discontiguous geometric properties: multiEdgeOf, multiCenterLineOf. Encapsulates a MultiPolygon to represent the following discontiguous geometric properties: multiCoverage, multiExtentOf. Encapsulates a MultiGeometry element. If a bounding shape is not provided for a feature collection, explain why. Allowable values are: innapplicable - the features do not have geometry unknown - the boundingBox cannot be computed unavailable - there may be a boundingBox but it is not divulged missing - there are no features