1000 ASCII string (up to 255 bytes long) in extended data
1001 Registered application name (ASCII string up to 31 bytes long) for extended data
1002 Extended data control string (“{”or “}”)
1003 Extended data layer name
1004 Chunk of bytes (up to 127 bytes long) in extended data
1005 Entity handle in extended data; text string of up to 16 hexadecimal digits
1010 A point in extended data
DXF: X value (followed by 1020 and 1030 groups)
APP: 3D point
1020,1030 DXF: Y and Z values of a point
1011 A 3D world space position in extended data
DXF: X value (followed by 1021 and 1031 groups)
APP: 3D point
1021,1031 DXF: Y and Z values of a world space position
1012 A 3D world space displacement in extended data
DXF: X value (followed by 1022 and 1032 groups)
APP: 3D vector
1022,1032 DXF: Y and Z values of a world space displacement
1013 A 3D world space direction in extended data
DXF: Xvalue (followed by 1022 and 1032 groups)
APP: 3D vector
1023,1033 DXF: Y and Z values of a world space direction
1040 Extended data double-precision floating-point value
1041 Extended data distance value
1042 Extended data scale factor
1070 Extended data 16-bit signed integer
1071 Extended data 32-bit signed long
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