DDI Data Documentation 3.3
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.. toctree::
   :maxdepth: 1
   :caption: Topics

   topics/Study/index
   topics/Classification/index
   topics/Data Capture/index
   topics/Data Description/index
   topics/Foundational/index
   topics/Agent/index
   topics/Non-Packaging Items/index
   topics/All Content Items/index

.. toctree::
   :maxdepth: 1
   :caption: Items and Fields

   item-types/index
   composite-types/index