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Check out https://docs.jboss.org/author/display/TEIID/XML+Definition in the Data Roles section of our Developers Guide.
Note that Teiid Designer 8.2 (due out this month) contains editing capability for managing row/column level security. See the Security and Data Access section of the draft Teiid Designer 8.2 Users Guide.
Teiid Designer Project
Thank you both for the great links, this is exactly what I was looking for!