Parametric Design's zone mechanism is implemented using Creo Elements/Direct Drafting infos. The info text PD_ZONE is used to specify which drawing elements are in the Parametric Design zone. Any drawing element in the current part that has the info text PD_ZONE attached to it is included in the zone. By treating the zone as simply a collection of element infos, several powerful options for working with the zone become available. The following sections contain a few ideas.