DMN List and Table Basics Beginners in DMN often define a separate variable for every simple value in their model, a string, for example, or a number. But it’s often far better to group related values within a single variable, and the FEEL language in DMN has multiple ways to do that: structure, sometimes called a context, identifies each component value with a name. For example, the structure Customer could have components Name, Birth Date, Tax ID, etc.