Chapter 6 -- ENTITIES Section
XLINE

The following group codes apply to xline entities. In addition to the group codes described here, see "Common Group Codes for Entities." For information about abbreviations and formatting used in this table, see "Formatting Conventions in This Reference."

Xline group codes
Group codes Description

100

Subclass marker (AcDbXline)

10

First point (in WCS)
DXF: X value; APP: 3D point

20, 30

DXF: Y and Z values of first point (in WCS)

11

Unit direction vector (in WCS)
DXF: X value; APP: 3D vector

21, 31

DXF: Y and Z values of unit direction vector (in WCS)