[WIP] Add versions table to docs

docs/source/index.rst

@@ -42,6 +42,7 @@ breaking down the barriers to data sharing in neuroscience.
    extensions
    building_api
    validation
+   versions
    api_docs
    software_process
    make_roundtrip_test

docs/source/versions.rst

@@ -0,0 +1,91 @@
+.. _versions:
+
+PyNWB Versions and HDMF Versions
+==========================================
+
+PyNWB relies heavily on the HDMF package which is developed in tandem with PyNWB. Each release of PyNWB is
+compatible with particular versions of HDMF.
+
++----------------+-------------------------+
+| PyNWB Version  | Compatible HDMF Version |
++================+=========================+
+| 1.4.0          | >=2.1.0, <3             |
++----------------+-------------------------+
+| 1.3.3          | >=1.6.4, <2             |
++----------------+-------------------------+
+| 1.3.1 to 1.3.2 | >=1.6.2, <2             |
++----------------+-------------------------+
+| 1.3.0          | >=1.6.1, <2             |
++----------------+-------------------------+
+| 1.2.0 to 1.2.1 | >=1.5.4, <2             |
++----------------+-------------------------+
+| 1.1.2          | 1.3.3                   |
++----------------+-------------------------+
+| 1.1.1          | 1.3.2                   |
++----------------+-------------------------+
+| 1.1.0          | 1.2.0                   |
++----------------+-------------------------+
+| 1.0.3          | 1.0.4                   |
++----------------+-------------------------+
+
+PyNWB Versions and NWB Schema Versions
+==========================================
+
+Each release of PyNWB is bundled with the latest version of the NWB schema at the time of release (referred to here as
+version X). Each release of PyWNB can read any data written with NWB version 2.0.0 to version X and writes data only
+in version X.
+
+When modifying existing NWB data, if data written with an NWB version (at least 2.0.0) that is older than X is loaded
+by PyNWB and then the data is modified by PyNWB (i.e., calls ``write`` on the IO object), then NWB version X will be
+added to the file and the data will be (in most cases) transformed to comply with the newer schema version X.
+
++----------------+--------------------------+---------------------------+
+| PyNWB Version  | Reads NWB Schema Version | Writes NWB Schema Version |
++================+==========================+===========================+
+| 1.4.0          | 2.0.0 to 2.2.5           | 2.2.5                     |
++----------------+--------------------------+---------------------------+
+| 1.3.2 to 1.3.3 | 2.0.0 to 2.2.5           | 2.2.5                     |
++----------------+--------------------------+---------------------------+
+| 1.3.1          | 2.0.0 to 2.2.4           | 2.2.4                     |
++----------------+--------------------------+---------------------------+
+| 1.3.0          | 2.0.0 to 2.2.2           | 2.2.2                     |
++----------------+--------------------------+---------------------------+
+| 1.2.0 to 1.2.1 | 2.0.0 to 2.2.1           | 2.2.1                     |
++----------------+--------------------------+---------------------------+
+| 1.1.0 to 1.1.2 | 2.0.0 to 2.1.0           | 2.1.0                     |
++----------------+--------------------------+---------------------------+
+| 1.0.3          | 2.0.0 to 2.0.2           | 2.0.2                     |
++----------------+--------------------------+---------------------------+
+
+For details about changes between NWB schema versions, see the `NWB format release notes
+<https://nwb-schema.readthedocs.io/en/latest/format_release_notes.html>`_.
+
+NWB Schema and hdmf-common Schema Versions
+=================================================
+
+Each release of the NWB schema is bundled with a particular release of the hdmf-common schema.
+
+Only releases of NWB schema that are used by PyNWB are listed below.
+
++--------------------+----------------------------+
+| NWB Schema Version | hdmf-common Schema Version |
++====================+============================+
+| 2.2.2 to 2.2.5     | 1.1.3                      |
++--------------------+----------------------------+
+| 2.2.1              | 1.1.2                      |
++--------------------+----------------------------+
+| <=2.1.0            | None                       |
++--------------------+----------------------------+
+
+For details about changes between hdmf-common schema versions, see the `hdmf-common release notes
+<https://hdmf-common-schema.readthedocs.io/en/latest/format_release_notes.html>`_.
+
+PyNWB Versions and hdmf-common Schema Versions
+=================================================
+
+Each release of PyNWB is bundled with a release of the NWB schema, which itself is bundled with a particular
+release of the hdmf-common schema. However, PyNWB loads the release of the hdmf-common schema available from the
+HDMF package installed locally rather than the bundled release of the hdmf-common schema within the bundled NWB schema.
+
+In PyNWB version 1.4.0, this could lead to an incompatibility between the version of hdmf-common schema (1.1.3)
+that is bundled with PyNWB and the version of hdmf-common schema (1.2.0+) used by HDMF.