These commands provide construction aids. All of the placement commands result in graphics being created in the PDS category for non-PDS graphics. All of the revision commands are prohibited from manipulating any PDS graphics other than those created by the corresponding placement commands.
Construction Place Commands --- Create graphics in the PDS category for non-PDS Graphics.
Construction Copy Commands --- Copy non-PDS graphics in the PDS category created by the Construction Place commands.
Construction Revise Commands --- Manipulate graphics created by the corresponding construction place commands.