A discrete coverage consists of a domain set, range set and optionally acoverage function. The domain set consists of either spatial or temporal geometry objects,finite in number. The range set is comprised of a finite number of attribute values each ofwhich is associated to every direct position within any single spatiotemporal object in thedomain. In other words, the range values are constant on each spatiotemporal object in thedomain. This coverage function maps each element from the coverage domain to an element inits range. The coverageFunction element describes the mapping function. This element servesas the head of a substitution group which may contain any discrete coverage whose type isderived from gml:DiscreteCoverageType.
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
<element name="AbstractDiscreteCoverage" type="gml:DiscreteCoverageType" abstract="true" substitutionGroup="gml:AbstractCoverage"><annotation><documentation>A discrete coverage consists of a domain set, range set and optionally a coverage function. The domain set consists of either spatial or temporal geometry objects, finite in number. The range set is comprised of a finite number of attribute values each of which is associated to every direct position within any single spatiotemporal object in the domain. In other words, the range values are constant on each spatiotemporal object in the domain. This coverage function maps each element from the coverage domain to an element in its range. The coverageFunction element describes the mapping function. This element serves as the head of a substitution group which may contain any discrete coverage whose type is derived from gml:DiscreteCoverageType.</documentation></annotation></element>