TODO
See also
Tasks:
Add Custom and Extended Data
Modify Extended Data
Delete Extended Data
Tutorials:
Storing Custom Data in DXF Files
Basics:
Extended Data
Extension Dictionary
DXF Tags
Classes:
ezdxf.entities.xdata.XData
ezdxf.entities.xdict.ExtensionDict
ezdxf.entities.XRecord
ezdxf.entities.Dictionary
ezdxf.entities.DictionaryVar
Helper-Classes:
ezdxf.entities.xdata.XDataUserList
ezdxf.entities.xdata.XDataUserDict
ezdxf.urecord.UserRecord
ezdxf.urecord.BinaryRecord