DXF_Reference

dxf format
  organization of this reference
  revisions to the dxf reference
  formatting conventions in this reference
  object and entity codes
  group code value types
  group codes in numerical order
header section
  header section group codes
    revised vport header variables
    special handling of date/time variables
classes section
  classes section group codes
    default class values
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
blocks section
  blocks section group codes
  block
  endblk
entities section
  common group codes for entities
  3dface
  3dsolid
  acad_proxy_entity
  arc
  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
  hatch
    boundary path data
    pattern data
  helix
  image
  insert
  leader
  light
  line
  lwpolyline
  mline
  mleader
  mleaderstyle
    common mleaderstyle group codes
    mleaderstyle context data group codes
    mleaderstyle leader node group codes
    mleaderstyle leader line group codes
  mtext
  oleframe
  ole2frame
  point
  polyline
    polyface meshes
  ray
  region
  section
  seqend
  shape
  solid
  spline
  sun
  surface
    extruded surface
    lofted surface
    revolved surface
    swept surface
  table
  text
  tolerance
  trace
  underlay
  vertex
  viewport
  wipeout
  xline
objects section
  object section group codes
    object ownership
  common group codes for objects
  acad_proxy_object
  acdbdictionarywdflt
  acdbplaceholder
  datatable
  dictionary
  dictionaryvar
  dimassoc
  field
  group
  idbuffer
  imagedef
  imagedef_reactor
  layer_index
  layer_filter
  layout
  lightlist
  material
  mlinestyle
  object_ptr
  plotsettings
  rastervariables
  render
    renderenvironment
    mentalrayrendersettings
    renderglobal
  section
    section manager
    section settings
    section type settings
    section geometry settings
  spatial_index
  spatial_filter
  sortentstable
  sunstudy
  tablestyle
  underlaydefinition
  visualstyle
  vba_project
  wipeoutvariables
  xrecord
thumbnailimage section
  thumbnailimage section group codes
drawing interchange file formats
  ascii dxf files
    general dxf file structure
    group codes in dxf files
      ascii control characters in dxf files
    header group codes in dxf files
    class group codes in dxf files
    symbol table group codes in dxf files
      symbol table example
    blocks group codes in dxf files
    entity group codes in dxf files
    object group codes in dxf files
    writing a dxf interface program
      reading a dxf file
      writing a dxf file
  binary dxf files
  slide files
    old slide header
  slide library files
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