                         procedure; the  `Oracle documentation`__ has more
                         details.
  =====================  =====================================================
  
  __ https://docs.oracle.com/database/121/SPATL/GUID-3BD00273-E74F-4830-9444-A3BB15AA0AC4.htm#SPATL466
  
  Example::
  
      >>> from django.contrib.gis.db.models import Extent, Union
      >>> WorldBorder.objects.aggregate(Extent('mpoly'), Union('mpoly'))
 
</s> remove .. [#fnsdorelate] *See* `SDO_RELATE documentation <https://docs.oracle.com/database/121/SPATL/sdo_relate.htm#SPATL1039>`_, from the Oracle Spatial and Graph Developer's Guide.
 </s> add .. [#fnsdorelate] *See* `SDO_RELATE documentation <https://docs.oracle.com/en/
   database/oracle/oracle-database/18/spatl/spatial-operators-reference.html#
   GUID-97C17C18-F05E-49B4-BE11-E89B972E2A02>`_, from the Oracle Spatial and
   Graph Developer's Guide. </s> remove `Oracle
<https://docs.oracle.com/database/121/SPATL/sdo_geom-sdo_mbr.htm#GUID-646638D0-2C5F-490A-AF63-DE9B7A4C97C1__CHDJCEIH>`__,
 </s> add `Oracle <https://docs.oracle.com/en/database/oracle/oracle-database/18/spatl/
SDO_GEOM-reference.html#GUID-646638D0-2C5F-490A-AF63-DE9B7A4C97C1__CHDJCEIH>`__, </s> remove `Oracle <https://docs.oracle.com/database/121/SPATL/sdo_geom-sdo_mbc.htm#SPATL1554>`_
 </s> add `Oracle <https://docs.oracle.com/en/database/oracle/oracle-database/18/spatl/
SDO_GEOM-reference.html#GUID-82A61626-BB64-4793-B53D-A0DBEC91831A>`_ </s> remove   columns`_.

  .. _`identity columns`: https://docs.oracle.com/database/121/DRDAA/migr_tools_feat.htm#DRDAA109
 </s> add   columns <https://docs.oracle.com/en/database/oracle/oracle-database/18/drdaa/
  intro-to-tools-and-products-supporting-migraiton.html#GUID-14E4817B-F3BC-4D99
  -B471-A0ACDC303CC9>`__. </s> remove .. _Oracle manual: https://docs.oracle.com/database/121/NLSPG/toc.htm
.. _section 2: https://docs.oracle.com/database/121/NLSPG/ch2charset.htm#NLSPG002
.. _section 11: https://docs.oracle.com/database/121/NLSPG/ch11charsetmig.htm#NLSPG011
 </s> add .. _Oracle manual: https://docs.oracle.com/en/database/oracle/oracle-database/18/nlspg/index.html
.. _section 2: https://docs.oracle.com/en/database/oracle/oracle-database/18/nlspg/choosing-character-set.html
.. _section 11: https://docs.oracle.com/en/database/oracle/oracle-database/18/nlspg/character-set-migration.html
__ https://docs.oracle.com/en/database/oracle/oracle-database/18/spatl/
   spatial-concepts.html#GUID-CE10AB14-D5EA-43BA-A647-DAC9EEF41EE6
                         procedure; the  `Oracle documentation`__ has more
                         details.
  =====================  =====================================================
  
__ https://docs.oracle.com/en/database/oracle/oracle-database/18/spatl/
   spatial-concepts.html#GUID-CE10AB14-D5EA-43BA-A647-DAC9EEF41EE6
  
  Example::
  
      >>> from django.contrib.gis.db.models import Extent, Union
      >>> WorldBorder.objects.aggregate(Extent('mpoly'), Union('mpoly'))
keep keep keep keep replace keep keep keep keep keep
 Updated Oracle docs links to Oracle 18c. 
docs/ref/contrib/gis/geoquerysets.txt