Data aggregate description in a Meta Entity (Type) or Meta Data Aggregate
You can add a data aggregate description in a Meta Entity, Meta Entity Type, or Meta Data Aggregate. You must specify its characteristics in the Data aggregate description and Component usage sections. A data aggregate description can contain other descriptions, existing Meta Data Aggregates, and existing Data Elements (in the Pacbase facet) or existing Data (in the COBOL facet).
Data aggregate description
For a root data aggregate description, you must specify a name and label only. However, for each data aggregate subdescription, you must also specify its usage characteristics.- Name
- Enter the name of the data aggregate description.
- Label
- Enter the label of the data aggregate description.
Component usage
- Minimum Cardinality
- Enter a numeric value to indicate a minimum cardinality. The default value is 0, which means that the description is not mandatory in the User Entity.
- Maximum Cardinality
- Enter a numeric value to indicate a maximum cardinality for the data aggregate description in the User Entity. The default value is n for unbounded.
The value of the Maximum cardinality field must be higher than the value of the Minimum cardinality field. If it is not, an error will be displayed in the User Entity.
- Identifiers
- This table is used to specify the fields that constitute the identifiers
in the data aggregate description, that is to say, the fields that
are defined as keys. It means that a User Entity cannot call more
than one description with the same combination of identifiers. Click + to
add a field, or click a field and then click − to
remove it from the table. Click the other buttons to modify the order
of the fields in the table. Important: The cardinality of the identifiers must be (1-1). A presence check will be completed on each identifier.
- Unique
- In this table, you can add fields that you set as unique. It means that two descriptions cannot contain two unique fields with the same value. Click + to add a field, or click a field and then click − to remove it from the table. Click the other buttons to modify the order of the fields in the table.
- Sorts
- This table is used to give the order of the descriptions in the User Entity. The descriptions will be sorted in the order given in this table.
- Descending
- Check this box to sort the descriptions in the descending order. Clear the box if you prefer an ascending order.