📄 database_objects_al_u05_c.htm
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<font face=Arial color=#003399 size=3><b> <a href="dxf_group_codes.htm">DXF Group Codes</a>
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<font face=Arial color=#003399 size=3><b><a href="advanced_dxf_issues_al_u05_c.htm"><img src=images/book2.gif border=0> Advanced DXF Issues</a>
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<font face=Arial color=#003399 size=3><b><img src=images/bk_space.gif border=0> <img src=images/book2.gif border=0> Database Objects
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<p><font face="MS Sans Serif,Arial" size=2>AutoCAD drawings consist largely of structured containers for database objects. Database objects each have the following:
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<font face="MS Sans Serif,Arial" size=2><UL type=square><LI>Handle whose value is unique to the drawing/DXF file, and is constant for the lifetime of the drawing. This format has existed since AutoCAD Release 10, but as of AutoCAD Release 13, handles are always enabled.
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<font face="MS Sans Serif,Arial" size=2><LI>Optional xdata table, just as entities have had since AutoCAD Release 11.
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<font face="MS Sans Serif,Arial" size=2><LI>Optional persistent reactor table.
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<font face="MS Sans Serif,Arial" size=2><LI>Optional ownership pointer to an extension dictionary, which in turn owns subobjects placed in it by an application.
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<p><font face="MS Sans Serif,Arial" size=2></UL> Symbol tables and symbol table records are database objects and, thus, have a handle. They can also have xdata and persistent reactors in their DXF records.
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