and find them in \dcm4chee-arc-light-5.10.5\dcm4chee-arc-xdsi\src\main\resources\schema\ebRS\rim.xsd
<complexType name="AssociationType1">
<annotation>
<documentation xml:lang="en">
Association is the mapping of the same named interface in ebRIM.
It extends RegistryObject.
An Association specifies references to two previously submitted
registry entrys.
The sourceObject is id of the sourceObject in association
The targetObject is id of the targetObject in association
</documentation>
</annotation>
<complexContent>
<extension base="tns:RegistryObjectType">
<attribute name="associationType" type="tns:referenceURI"
use="required" />
<attribute name="sourceObject" type="tns:referenceURI"
use="required" />
<attribute name="targetObject" type="tns:referenceURI"
use="required" />
</extension>
</complexContent>
</complexType>