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CITY\ **data**
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CITY\ **data** is a middleware that enables users to perform operations on data from various sources via the use of the following abstractions:

- **Producer**: connects to data sources and fetches data
- **Operation**: describes transformations to be performed on producer outputs (data)
- **Runner**: calls a series of producers, executes a series of operations on the producer's outputs, and then outputs the resulting data

.. image:: ../images/citydata-architecture.jpg
   :width: 1000
   :alt: CITY\ **data** architectural diagram

For more information, please check the :doc:`/citydata/architecture/index` and :doc:`/citydata/references/index` pages. Tutorials will be included soon.

.. toctree::
   :maxdepth: 1
   :caption: Contents

   about/index
   architecture/index
   references/index