This document describes some atomic tests that I can use in EARL. It is completely informal, and is used primarily for examples, but tests described here will remain here to be used, so you can provide their URI in EARL statements.
Passing this test indicates that the subject (which should be a table) is a data table. Failing it means the subject is a layout table. If the subject is not a table, but contains tables, then passing it means that none of the tables contained in the subject is a layout table. Failing it means that at least one of the tables contained by the subject (but not necessarily all of them) is a layout table.