To expand on previous answer, right now this would be represented as: key firstname string; key lastname string; auto full_name <- concat(firstname, ' ', last

To expand on previous answer, right now this would be represented as: key firstname string; key lastname string; auto full_name <- concat(firstname, ' ', lastname); datasource people ( firstname:firstname, lastname:lastname ) address people; datasource persons ( firstname: firstname, last_name:lastname ) address persons; And a select full_name; Could resolve from either table. The missing bit if you're trying to define a universe across both is actually the union construct; right now a concept is assumed to have one cardinality space. Something like: auto all_first_names <- union(first_name1, first_name2); There's a coupling between the concept definition both as a function input and as a semantic value. They could be decomposed, but you'd still need to recompose them at some point before running a query.