Attribute Clusters can only be created by clicking on the 'Add
Attribute Cluster' button on the User Interface Palette (Note that they
are the only User Interface artifact created by clicking a button): 
. Note also that the Attribute Cluster
will always be added as the last Cluster in the User Interface Canvas; if
desired, administrators can subsequently move the newly added Attribute
Cluster to another location on the Canvas, as described earlier in this
chapter.
At Activate time, Dynamic Evidence Type Versions will be checked to ensure that all Attribute Clusters contain at least one Field.
The following properties can be set in respect of a Data Attribute
Cluster:
| Property name | Description |
|---|---|
| Title | An optional Cluster Title for the default locale. Note that most Clusters have Titles, but they are not in fact enforced as mandatory by the Dynamic Evidence infrastructure. |
| Title ID | A Resource property identifier for the Title property. Mandatory if a Title is provided (this property is only displayed in the Editor if the Title has one or more characters). |
| Description | An optional Cluster Description for the default locale. Cluster Descriptions, if provided, appear below the Title at runtime. |
| Description ID | A Resource property identifier for the Description property. Mandatory if a Description is provided (this property is only displayed in the Editor if the Title has one or more characters). |
| Number of Columns | A mandatory numeric drop down containing values from 1 to 4, the Number of Columns dictates how many Columns will be used to lay out all contained Fields in this Attribute Cluster in generated create, modify and view pages in respect of this Dynamic Evidence Type Version. Typically, this value is set to 2 (and occasionally 1) for most Dynamic Evidence Types. |
| On Create Page | Possible values are true or false. If true, the Attribute Cluster is shown on the Case Evidence create page; if false, the Cluster is not displayed on the Create page. In most cases this should be set to true (i.e. The check box should be checked). |
| On Modify Page | Possible values are true or false. If true, the Attribute Cluster is shown on the Case Evidence modify page; if false, the Cluster is not displayed on the Modify page. In most cases this should be set to true (i.e. The check box should be checked). |
| On View Page | Possible values are true or false. If true, the Attribute Cluster is shown on the Case Evidence view page; if false, the Cluster is not displayed on the View page. In most cases this should be set to true (i.e. The check box should be checked). |
| Online Help | An optional property containing Cluster information for Online Help on Case Evidence screens. |
warning: Care must be taken with the use of
the 'On Create Page' and 'On Modify Page' properties to ensure that
Clusters which do not appear on Case Evidence maintenance screens do not
contain Fields in respect of Data Attributes which are marked as
Mandatory. This is a logical error (which is not currently enforced by the
Editor), in that it would not be possible for case workers to provide
values for mandatory Attributes, and hence should be avoided.