Available XData Group Codes

Extended data technology supports the group codes in the table below.

Code	Data Type	Description
1000	String	An arbitrary String value up to 255 letters long.
1001	Application Name	An application name as an OdString value up to 31 letters long. This is a special group code that begins a sequence of group codes and associates the sequence with a registered application.
1002	Control String	A control code that can be "{" or "}", which subdivides blocks into a sequence of group codes. The left brace begins a block and the right brace completes a block. Blocks can be nested. Only the application associated with a sequence is aware of the block destinations.
1003	Layer Name	Name of a layer that is associated with the extended data.
1004	Binary Chunk	Binary data that is organized into chunks. Each chunk is an array of bytes. Each byte represents two hexadecimal symbols. Maximal length of a chunk is 127 bytes.
1005	Handle	A handle of an object. The OdDbHandle class implements the handle.
1010	3D Point	Three real values, in the order X,Y,Z. These values define world space coordinates of a point or vector. When an object is transformed, coordinates of this point or vector are not transformed within extended data.
1011	3D Position	Three real values, in the order X,Y,Z, that define world space coordinates of a point and are moved, scaled, rotated, stretched, and mirrored along with the parent. When an object is transformed, coordinates of this point are also transformed within extended data.
1012	3D Displacement	Three real values, in the order X,Y,Z, that define a vector and are scaled, rotated, and mirrored along with the parent. When an object is transformed, this vector is also transformed within extended data.
1013	3D Direction	Three real values, in the order X,Y,Z, that define a unit vector and are rotated and mirrored along with the parent. When an object is transformed, the direction is changed only within extended data.
1040	Real	A real value (any real data).
1041	Distance	A real value which is scaled along with the parent. When an object is transformed, this real value is changed within extended data using the scale factor of the transformation matrix.
1042	Scale Factor	A real value which is scaled along with the parent analogously to 1041. The difference between 1041 and 1042 is application-defined.
1070	Short Integer	A 16-bit short integer value.
1071	Long Integer	A 32-bit long integer value.

The ValueType enumerator declares the symbolic notation for the group codes supported by extended data technology:


kDxfXdAsciiString   = 1000,   //  Arbitrary string
kDxfRegAppName      = 1001,   //  Application name (string)
kDxfXdControlString = 1002,   //  Control string
kDxfXdLayerName     = 1003,   //  Layer name (string)
kDxfXdBinaryChunk   = 1004,   //  Binary chunk
kDxfXdHandle        = 1005,   //  Handle (OdDbHandle)
kDxfXdXCoord        = 1010,   //  3D Point (OdGePoint3d)
kDxfXdYCoord        = 1020,   //  Coordinate (Double)
kDxfXdZCoord        = 1030,   //  Coordinate (Double)
kDxfXdWorldXCoord   = 1011,   //  3D Point (OdGePoint3d)
kDxfXdWorldYCoord   = 1021,   //  Coordinate (Double)
kDxfXdWorldZCoord   = 1031,   //  Coordinate (Double)
kDxfXdWorldXDisp    = 1012,   //  3D Point (OdGePoint3d)
kDxfXdWorldYDisp    = 1022,   //  Coordinate (Double)
kDxfXdWorldZDisp    = 1032,   //  Coordinate (Double)
kDxfXdWorldXDir     = 1013,   //  3D Point (OdGePoint3d)
kDxfXdWorldYDir     = 1023,   //  Coordinate (Double)
kDxfXdWorldZDir     = 1033,   //  Coordinate (Double)
kDxfXdReal          = 1040,   //  Double
kDxfXdDist          = 1041,   //  Double
kDxfXdScale         = 1042,   //  Double
kDxfXdInteger16     = 1070,   //  16-bit integer
kDxfXdInteger32     = 1071,   //  32-bit integer

Group codes and their data values are programmatically organized in the dynamically linked sequence of resbuf-instances.

See Also