gml:abstractReference 

gml:abstractReference may be used as the head of a subtitution group of more specific elements providing a value by-reference.

Element Information

Model

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="abstractReference" type="gml:ReferenceType" abstract="true">
  <annotation>
    <documentation>gml:abstractReference may be used as the head of a subtitution group of more specific elements providing a value by-reference.</documentation>
  </annotation>
</element>

Sample