Attribute Derivation Rules

When attributes are imported, the values of attributes may be automatically set according to user-defined rules based on DB Expressions, known as Attribute Derivation Rules.

Default attribute derivation rules are not shipped with Schematic Model Manager.

It is recommended that attribute derivation rules are configured prior to importing data into the schematic database. This is because attribute derivation rules cannot be applied to existing elements in the schematic database, other than by re-importing existing schematic data from the source import file or files.

A rule is set up by selecting the element type or types to which the attribute in question belongs. The attribute itself is then selected. The list of attributes available for selection is restricted to those common to all the selected element types.

The DB Expression to be applied to the attribute during processing is then entered.

If required, filters may be set up to restrict the instances of elements, based on the value of one or more of their attributes, to which the rule is applied.

Rules are grouped into rule groups. Rule groups may contain both rules and other rule groups. As required, individual rules or an entire rule group may be "switched off", that means, set that they are not applied on import.

For further information, refer to View/Edit Attribute Derivation Rules.