PROGRAMMING GUIDE
The Exchange Reference groups the PRC entities that specify graphics into the graphic module. The graphics module includes the following categories of PRC entities:
Some characteristics of PRC entities that specify graphics can be accessed only through the Exchange miscellaneous cascaded attributes. These characteristics include the entity's layer, coordinate system, and style attributes. Style attributes include line pattern index, RGB color index, and transparency setting. (See Parsing attributes that appear in an entity base.)