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.

<complexType name="DirectionDescriptionType">
    <annotation>
        <documentation>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.</documentation>
    </annotation>
    <choice>
        <element name="compassPoint" type="gml:CompassPointEnumeration" />
        <element name="keyword" type="gml:CodeType" />
        <element name="description" type="string" />
        <element name="reference" type="gml:ReferenceType" />
    </choice>
</complexType>

• DirectionDescriptionType
• gml:DirectionDescription