Revisions to the DXF Reference

1: DXF Format
  Organization of This Reference

  - Formatting Conventions in This Reference

  Object and Entity Codes

  Group Code Value Types

  Group Codes in Numerical Order

2: HEADER Section
  HEADER Section Group Codes

  - Revised VPORT Header Variables

  - Special Handling of Date/Time Variables

3: CLASSES Section
  CLASSES Section Group Codes

  - Default Class Values

4: TABLES Section
  Symbol Table Group Codes

  Common Symbol Table Group Codes

  - Common Group Codes for Symbol Table Entries

  APPID

  BLOCK_RECORD

  DIMSTYLE

  LAYER

  LTYPE

  STYLE

  UCS

  VIEW

  VPORT

5: BLOCKS Section
  BLOCKS Section Group Codes

  BLOCK

  ENDBLK

6: ENTITIES Section
  Common Group Codes for Entities

  3DFACE

  3DSOLID

  ACAD_PROXY_ENTITY

  ARC

  ARCALIGNEDTEXT

  ATTDEF

  ATTRIB

  BODY

  CIRCLE

  DIMENSION

  - Common Dimension Group Codes

  - Aligned Dimension Group Codes

  - Linear and Rotated Dimension Group Codes

  - Radial and Diameter Dimension Group Codes

  - Angular Dimension Group Codes

  - Ordinate Dimension Group Codes

  - Dimension Style Overrides

  ELLIPSE

  - ELLIPSE Command's Parameter Option

  HATCH

  - Boundary Path Data

  - Pattern Data

  IMAGE

  INSERT

  LEADER

  LINE

  LWPOLYLINE

  MLINE

  MTEXT

  OLEFRAME

  OLE2FRAME

  POINT

  POLYLINE

  - Polyface Meshes

  RAY

  REGION

  RTEXT

  SEQEND

  SHAPE

  SOLID

  SPLINE

  TEXT

  TOLERANCE

  TRACE

  VERTEX

  VIEWPORT

  WIPEOUT

  XLINE

7: OBJECTS Section
  OBJECT Section Group Codes

  - Object Ownership

  Common Group Codes for Objects

  ACAD_PROXY_OBJECT

  ACDBDICTIONARYWDFLT

  ACDBPLACEHOLDER

  DICTIONARY

  DICTIONARYVAR

  GROUP

  IDBUFFER

  IMAGEDEF

  IMAGEDEF_REACTOR

  LAYER_INDEX

  LAYOUT

  MLINESTYLE

  OBJECT_PTR

  PLOTSETTINGS

  RASTERVARIABLES

  SPATIAL_INDEX

  SPATIAL_FILTER

  SORTENTSTABLE

  XRECORD

8: THUMBNAILIMAGE Section
  THUMBNAILIMAGE Section Group Codes

A: Drawing Interchange File Formats
  ASCII DXF Files

  - General DXF File Structure

  - Group Codes in DXF Files

  - Header Group Codes in DXF Files

  - Class Group Codes in DXF Files

  - Symbol Table Group Codes in DXF Files

  - Blocks Group Codes in DXF Files

  - Entity Group Codes in DXF Files

  - Object Group Codes in DXF Files

  - Writing a DXF Interface Program

  Binary DXF Files

  Slide Files

  - Old Slide Header

  Slide Library Files

B: Advanced DXF Issues
  Database Objects

  Persistent Inter-Object Reference Handles

  - Pointer and Ownership References

  - Hard and Soft References

  - Arbitrary Handles

  - 1005 Group Codes

  Subclass Markers

  Extension Dictionary and Persistent Reactors

  Extended Data

  Object Coordinate Systems (OCS)

  Arbitrary Axis Algorithm