gml.3.2.1.feature.xsd Maven / Gradle / Ivy

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		feature.xsd
		See ISO/DIS 19136 Clause 9.
A GML feature is a (representation of a) identifiable real-world object in a selected domain of discourse. The feature schema provides a framework for the creation of GML features and feature collections.
	
	
	
	
		
			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.
		
		
			
				
					
					
				
			
		
	
	
		
			This abstract element serves as the head of a substitution group which may contain any elements whose content model is derived from gml:AbstractFeatureType.  This may be used as a variable in the construction of content models.  
gml:AbstractFeature may be thought of as "anything that is a GML feature" and may be used to define variables or templates in which the value of a GML property is "any feature". This occurs in particular in a GML feature collection where the feature member properties contain one or multiple copies of gml:AbstractFeature respectively.
		
	
	
		
			
		
		
		
	
	
		
			This property describes the minimum bounding box or rectangle that encloses the entire feature.
		
	
	
		
			
				
				
			
		
		
	
	
		
			gml:EnvelopeWithTimePeriod is provided for envelopes that include a temporal extent. It adds two time position properties, gml:beginPosition and gml:endPosition, which describe the extent of a time-envelope.  
Since gml:EnvelopeWithTimePeriod is assigned to the substitution group headed by gml:Envelope, it may be used whenever gml:Envelope is valid.
		
	
	
		
			
				
					
					
				
				
			
		
	
	
		
			The gml:locationName property element is a convenience property where the text value describes the location of the feature. If the location names are selected from a controlled list, then the list shall be identified in the codeSpace attribute.
		
	
	
		
			The gml:locationReference property element is a convenience property where the text value referenced by the xlink:href attribute describes the location of the feature.
		
	
	
		
			To create a collection of GML features, a property type shall be derived by extension from gml:AbstractFeatureMemberType.
By default, this abstract property type does not imply any ownership of the features in the collection. The owns attribute of gml:OwnershipAttributeGroup may be used on a property element instance to assert ownership of a feature in the collection. A collection shall not own a feature already owned by another object.