You can limit which objects are selected and added to a selection set by using a selection filter. A selection filter list can be used to filter selected objects by properties or type. For example, you might want to select only blue objects or objects on a certain layer. You can also combine selection criteria. For example, you can create a selection filter that limits selection to blue circles on the layer named Pattern. Selection filters can be specified as a parameter for the different selection methods in Select Objects in the Drawing Area.