Flexible constructor to create dynamic list of heterogeneous properties for some kind of entity. This set of helpers useful to create properties like contacts or attributes for describe car/computer/etc.
You must create your own models for each kind of entity but it gives more flexibility, more simpler and allow to easily change default behavior.
read :doc:`tutorial` to see all picture of idea.
.. toctree:: :maxdepth: 2 install tutorial ref/index