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Application-Defined Data (AppData)
==================================
Starting at DXF R13, DXF objects can contain application-defined codes (AppData)
outside of XDATA.
All AppData is defined with a beginning (102, "{APPID") tag and according to the
DXF reference appear should appear before the first subclass marker.
There are two known use cases of this data structure in Autodesk products:
- ``ACAD_REACTORS``, store handles to persistent reactors in a DXF entity
- ``ACAD_XDICTIONARY``, store handle to the extension dictionary of a DXF entity
Both AppIDs are not defined/stored in the AppID table!
.. module:: ezdxf.entities.appdata
.. class:: AppData
Internal management class for Application defined data.
.. seealso::
- User reference: :ref:`application_defined_data`
- Internals about :ref:`app_data_internals` tags
.. automethod:: __contains__
.. automethod:: __len__
.. automethod:: add
.. automethod:: get
.. automethod:: set
.. automethod:: discard
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