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      referenceSystems.xsd
      3.0 updated 2010-01-26
      How to encode reference system definitions. 
      Builds on gmlBase.xsd to encode the data needed to define reference systems. GML 3.0 candidate schema, primary editor: Arliss Whiteside.
      
        GML is an OGC Standard.
        Copyright (c) 2001,2002,2010 Open Geospatial Consortium.
        To obtain additional rights of use, visit http://www.opengeospatial.org/legal/ .
      
      This schema encodes the Reference System (RS_) package of the extended UML Model for OGC Abstract Specification Topic 2: Spatial Referencing by Coordinates. That UML model is adapted from ISO 19111 - Spatial referencing by coordinates, as described in Annex B of Topic 2. The CS_CRS class is also encoded here, to eliminate the (circular) references from coordonateOperations.xsd to coordinateReferenceSystems.xsd. A modified version of the EX_Extent (DataType) class is also currently encoded here, using GML 3 schema types. (A more extensive version of the EX_Extent package might be XML encoded in the future, probably in a separate extent.xsd schema.) 
    
  
  
  
  
  
  
  
  
    
      Basic encoding for objects in the CRS model, simplifying the AbstracGMLType as needed for CRS objects. 
    
    
      
        
          
        
        
      
    
  
  
  
  
  
    
      Description of a spatial and/or temporal reference system used by a dataset.
    
    
      
        
          
            
              Identification of this Reference System. 
            
          
        
      
    
  
  
  
  
  
    
      Association to a Reference System, either referencing or containing the definition of that Reference System. 
    
    
      
    
    
  
  
  
  
  
    
      Abstract coordinate reference system, usually defined by a coordinate system and a datum. 
    
    
      
    
  
  
  
  
  
    
      Association to a CRS abstract coordinate reference system, either referencing or containing the definition of that CRS. 
    
    
      
        
          
        
        
      
    
  
  
  
  
    
      Identification of a reference system object. All of the attributes are optional, but there is a constraint that one or both of the "code" and "name" attributes must be included. 
    
    
      
        
          Identifier code or name, optionally from a controlled list or pattern defined by a code space. 
        
      
      
        
          Identifier of a code space within which one or more codes are defined. This attribute is optionally included only when the "code" attribute is included. This code space is often defined by some authority organization, where one organization may define multiple code spaces. The range and format of each Code Space identifier is defined by that code space authority. 
        
      
      
        
          Identifier of the version of the associated codeSpace or code, as specified by the codeSpace or code authority. This attribute is optionally included only when the "code" attribute is included. When appropriate, the version is identified by the effective date, coded using ISO 8601 date format. 
        
      
      
        
          The name by which this object is identified. 
        
      
      
        
          Unordered list of aliases by which this object is known. 
        
      
      
        
          Comments on or information about this object, including data source information. 
        
      
    
  
  
  
    
      Alternative identifier or name by which this object is known. 
    
    
      
        
          An alias of this object, as defined in the alias name space. 
        
      
      
        
          Identifier of the namespace that this alias name is defined in; for example, "ISO 2-char country code" or "EPSG abbreviation". 
        
      
      
        
          Remarks applying to this alias. 
        
      
    
  
  
  
    
      Extended identification and description of a reference system object. 
    
    
      
        
          
            
              Area or region in which this object is valid. 
            
          
          
            
              Description of domain of usage, or limitations of usage, for which this object is valid. 
            
          
        
      
    
  
  
  
    
      Information about the spatial, vertical, and/or temporal extent of a reference system object. Constraints: At least one of the elements "description", "boundingBox", "boundingPolygon", "verticalExtent", and temporalExtent" must be included, but more that one can be included when appropriate. Furthermore, more than one "boundingBox", "boundingPolygon", "verticalExtent", or temporalExtent" element can be included, with more than one meaning the union of the individual domains. 
    
    
      
        
          Description of spatial and/or temporal extent of this object. 
        
      
      
        
          Geographic domain of this reference system object. 
        
        
          
            Bounding box (or envelope) spatial domain of this object. 
          
        
        
          
            Bounding polygon horizontal spatial domain of this object. 
          
        
      
      
        
          Vertical spatial domain of this object. 
        
      
      
        
          Time period domain of this object.