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