Schema Central > NIEM 2.1 > direction.xsd > gml:DirectionDescriptionType
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direction descriptions are specified by a compass point code, a keyword, a textual description or a reference to a description.
A gml:compassPoint is specified by a simple enumeration.  	
In addition, thre elements to contain text-based descriptions of direction are provided.  
If the direction is specified using a term from a list, gml:keyword should be used, and the list indicated using the value of the codeSpace attribute. 
if the direction is decribed in prose, gml:direction or gml:reference should be used, allowing the value to be included inline or by reference.

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