Declare Index rule is a better approach.

1. Create a concrete class derived from the Index- BASE class.
2. Create Single Value properties in the new class to hold values of the embedded values.
3. Create a Declare Index rule with the APPROPRIATE embedded PAGE Context value that copies the embedded values into a new Index- instance.
4. Save the Declare Index rule. It EXECUTES immediately, adding and deleting instances of the new class.
5. Expose database columns corresponding to the Index- class.
6. Reference the Index- properties in the list view rule.

Declare Index rule is a better approach.

1. Create a concrete class derived from the Index- base class.
2. Create Single Value properties in the new class to hold values of the embedded values.
3. Create a Declare Index rule with the appropriate embedded Page Context value that copies the embedded values into a new Index- instance.
4. Save the Declare Index rule. It executes immediately, adding and deleting instances of the new class.
5. Expose database columns corresponding to the Index- class.
6. Reference the Index- properties in the list view rule.