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AutoCAD® 2002 - Autodesk

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Advanced DXF Issues<br />

B<br />

This appendix discusses the advanced concepts related<br />

In this chapter<br />

to DXF group codes.<br />

■<br />

■<br />

■<br />

■<br />

■<br />

■<br />

■<br />

Database Objects<br />

Persistent Inter-Object<br />

Reference Handles<br />

Subclass Markers<br />

Extension Dictionary and<br />

Persistent Reactors<br />

Extended Data<br />

Object Coordinate Systems<br />

(OCS)<br />

Arbitrary Axis Algorithm<br />

165

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