HP System Dictionary/XL General Reference Manual Vol 1 (32256-90004)

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entity is arbitrary, so there is no need to keep it synchronized between occurrences. The relationship-
position attribute assigns ordinal numbers to a set of relationships of the same type that have the same
parent entity. The ordinal numbers implicitly define the order in which the child entities of these
relationships occur within the parent entity. For example, in a series of relationships of the type RECORD
contains ELEMENT that have the same RECORD entity, the relationship-position attribute implicitly
defines the ordering of elements within the record. You can vary relationship-position attribute values
among linked relationships so that users in each domain can re-arrange their order. The relationship
CUSTOMER-ADDRESS contains LAST-NAME, for example, may be linked between domains. But in one
domain, its relationship-position value may indicate that LAST-NAME comes first in the record while in
another domain it may come last.
Linking Restrictions
Note that you can link entities only to entities, and you can link relationships only to relationships, and
only from a local domain version to a common domain version which must be linked together first.
Further, you can make links only between occurrences of the same type. For example, you cannot link an
entity of type RECORD to an entity of type FILE, nor can you link a relationship of type DATABASE
contains DATASET to a relationship of RECORD contains ELEMENT.