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.