returns xml fragment.
<response success="true" error="">
if success attribute is "true", the list association types has been returned like the xml sample below.
if success attribute is "false", the error attribute indicates the encountered error.
<response success="true" error="">
<AssociationTypes>
<AssociationType AssociationTypeID="0" AssociationTypeName="Related" ReverseNameTypeName="Related" />
<AssociationType AssociationTypeID="1" AssociationTypeName="Rendition" ReverseNameTypeName="Rendition" />
<AssociationType AssociationTypeID="2" AssociationTypeName="Copy of" ReverseNameTypeName="Original Copy" />
<AssociationType AssociationTypeID="3" AssociationTypeName="Parent Document" ReverseNameTypeName="Child Document" />
<AssociationType AssociationTypeID="4" AssociationTypeName="Derived From" ReverseNameTypeName="Derivation of this Document" />
</AssociationTypes>
</response>