About Advanced DXF Issues (DXF)
Several advanced concepts are related to DXF™ group codes.
Related Reference
About Database Objects (DXF)
Persistent Inter-Object Reference Handles (DXF)
Subclass Markers (DXF)
About Extension Dictionary and Persistent Reactors (DXF)
About Extended Data (DXF)
Object Coordinate Systems (OCS) in DXF
About Arbitrary Axis Algorithm (DXF)