Allows a definition to be associated with a preference.

C# |
public void AddDefinition( ResourceAttributeDefinition definition )

- definition (ResourceAttributeDefinition)

When no explicit expression is specified, an expression will be built automatically by combining all definitions added to the preference.
For example : If you added definitions with aliases of "DatasetA" and "DatasetB", the resulting expression will be "DatasetA + DatasetB".
Note: Once user explicitly specifies an expression, adding definitions will have no effect on the expression.