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This is documentation for Caché & Ensemble.

For information on converting to InterSystems IRIS, see the InterSystems IRIS Adoption Guide and the InterSystems IRIS In-Place Conversion Guide, both available on the WRC Distributions page (login required).

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Specifies the cardinality of this relationship property. Required for relationship properties. Not used for other properties.


To specify the cardinality of a relationship property, use the following syntax:

Relationship relname As classname [ Cardinality = cardinality; inverse = inverse ];

Where cardinality is one of the following:

  • one

  • many

  • parent

  • children


This keyword specifies the cardinality of a relationship property.

The Cardinality keyword is required for relationship properties. It is ignored by non-relationship properties.

For more information on relationships, see “Defining and Using Relationships” in Using Caché Objects.


There is no default. When you define a relationship, you must specify the Cardinality keyword.


Relationship Chapters As Chapter [ Cardinality = many; inverse = Book ];
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See Also