gml:DirectionDescriptionType 

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.

Complex Type Information

Model

gml:compassPoint | gml:keyword | gml:description | gml:reference
Children: gml:compassPoint, gml:description, gml:keyword, gml:reference

Used By

Element gml:DirectionPropertyType/gml:DirectionDescription

Source 

<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>