gml:abstractAssociationRole 

Applying this pattern shall restrict the multiplicity of objects in a property element using this content model to exactly one. An instance of this type shall contain an element representing an object, or serve as a pointer to a remote object.
Applying the pattern to define an application schema specific property type allows to restrict
-	the inline object to specified object types, 
-	the encoding to "by-reference only" (see 7.2.3.7),
-	the encoding to "inline only" (see 7.2.3.8).

Element Information

Model

ANY element from ANY namespace

Attributes

QName Type Fixed Default Use Inheritable Annotation
gml:remoteSchema anyURI optional
nilReason gml:NilReasonType optional
owns boolean false optional
xlink:actuate xlink:actuateType optional
xlink:arcrole xlink:arcroleType optional
xlink:href xlink:hrefType optional
xlink:role xlink:roleType optional
xlink:show xlink:showType optional
xlink:title xlink:titleAttrType optional
xlink:type xlink:typeType simple optional

Source 

<element name="abstractAssociationRole" type="gml:AssociationRoleType" abstract="true">
  <annotation>
    <documentation>Applying this pattern shall restrict the multiplicity of objects in a property element using this content model to exactly one. An instance of this type shall contain an element representing an object, or serve as a pointer to a remote object. Applying the pattern to define an application schema specific property type allows to restrict - the inline object to specified object types, - the encoding to "by-reference only" (see 7.2.3.7), - the encoding to "inline only" (see 7.2.3.8).</documentation>
  </annotation>
</element>

Sample