| '''Targettype left''' (TARGETTYPELEFT) || [[CONTEXT]] || Context object
|-
| '''Targettype right''' (TARGETTYPERIGHT)|| [[CONTEXTSCOPE]] || Context scope object, either a [[MetaClassScope]] or a [[QueryScope]]
|-
| '''Relation data template''' (RELATIONDATA)|| [[ACMCONTEXTSCOPERELDATA]] || MetaClass for template of relational data
|-
| '''Relation data metaclass''' (RELATIONDATAMETACLASS) || SYSREL_CONTEXTSCOPE || MetaClass containing the relational data objects
|}