**************************
#17 - Identity constraints
**************************



**Schema**

.. literalinclude:: /../tests/fixtures/defxmlschema/chapter17.xsd
   :language: xml
   :lines: 2-

**Models**

.. literalinclude:: /../tests/fixtures/defxmlschema/chapter17.py
   :language: python

**XML Document**

.. literalinclude:: /../tests/fixtures/defxmlschema/chapter17.xml
   :language: xml
   :lines: 2-

**xsData XML Document**

.. literalinclude:: /../tests/fixtures/defxmlschema/chapter17.xsdata.xml
   :language: xml
   :lines: 2-

**xsData JSON**

.. literalinclude:: /../tests/fixtures/defxmlschema/chapter17.json
   :language: json

.. admonition:: Samples Source
    :class: hint

    `Definitive XML Schema <http://www.datypic.com/books/defxmlschema/>`_
    by Priscilla Walmsley (c) 2012 Prentice Hall PTR