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.. _block_concept:
Blocks
======
Blocks are collections of DXF entities which can be placed multiple times as
block references in different layouts and other block definitions.
The block reference (:class:`~ezdxf.entities.Insert`) can be rotated, scaled,
placed in 3D space by :ref:`OCS` and arranged in a grid like manner, each
:class:`~ezdxf.entities.Insert` entity can have individual attributes
(:class:`~ezdxf.entities.Attrib`) attached.
Block Attributes
----------------
A block attribute (:class:`~ezdxf.entities.Attrib`) is a text annotation attached
to a block reference with an associated tag. Attributes are often used to add
information to block references which can be evaluated and exported by CAD
applications.
Extended Block Features
-----------------------
Autodesk added many new features to BLOCKS (dynamic blocks, constraints) as
undocumented DXF entities, many of these features are not fully supported by
other CAD application and `ezdxf` also has no support or these features beyond
the preservation of these undocumented DXF entities.
.. seealso::
- :ref:`Blocks` Section
- :ref:`tut_blocks`
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