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Is it possible to create additional 'fields' in the geodatabase domain system table (GDB_items) in SDE 10.3/Oracle?

It would be handy to store additional information in domains. For example:

  • CODE [domain coded value]
  • NAME [domain description]
  • Additional fields: DETAILS, COMMENTS, RELATED_DOCUMENT, etc.

I know it wouldn't be accessible in ArcGIS desktop's out-of-box functionality, but maybe it would be possible to query it with SQL?

The SQL used to access the domain would look like this, but include additional 'fields':

SELECT         
  EXTRACTVALUE(CodedValues.COLUMN_VALUE, 'CodedValue/Code') AS DOMAIN_CODE, 
  EXTRACTVALUE(CodedValues.COLUMN_VALUE, 'CodedValue/Name') AS DOMAIN_DESCRIPTION
FROM         
  SDE.GDB_ITEMS_VW
  JOIN SDE.GDB_ITEMTYPES
  ON SDE.GDB_ITEMS_VW.Type = SDE.GDB_ITEMTYPES.UUID,
  TABLE(XMLSEQUENCE(XMLType(Definition).Extract('/GPCodedValueDomain2/CodedValues/CodedValue'))) CodedValues 
WHERE       
  SDE.GDB_ITEMS_VW.NAME = 'STRATEGY'

Or, as an alternative, would it be an acceptable practice to create a separate table that is related to the domain by the CODE value? And then join to it using the query mentioned above?

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    If you don't mind using a completely unsupported geodatabase, with the possibilty of corruption at the next upgrade... All-in-all, I'd recommend a parallel table (owned by a different user). – Vince May 10 '16 at 20:10
  • @Vince: Why owned by a different user? – Wilson May 10 '16 at 21:17
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    To prevent namespace pollution. – Vince May 10 '16 at 21:53
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Vince's comment as the answer:

...I'd recommend a parallel table.

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