Create additional 'fields' in GDB domain system table (GDB_items)?

Question

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
cross join
 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?

• Vince: 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).
• User1974: @Vince: Why owned by a different user?
• Vince: To prevent namespace pollution.

Answer 1

Vince's comment as the answer:

...I'd recommend a parallel table.