All undirected graph type relationships between Geo-Objects (instance data) must be done through the GeoPrism Registry API.
<xs:complexType name="undirected-graph">
<xs:attribute name="code" type="xs:string" use="required" />
<xs:attribute name="label" type="xs:string" use="required" />
<xs:attribute name="description" type="xs:string" use="optional" />
</xs:complexType>
<undirected-graph
code="ADJECENT_TO"
label="Adjecent To (MOH)"
description="Links locations which are adjecent to each other"/>