Hi, I'm still trying to build an *abstract* Relation Algebra using the finally tagless style. My guess is that finally tagless style allows one to create a syntax without any initial dependency to an implementation. Ie. once one has created the syntax in this style one can then proceed to construct terms. So this is my goal, create a syntax for relational algebra, express an abstract relational algorithm in this syntax and worry about implementation / compilation / evaluation *later*. But at least being able to express a correctly typed term. I presume I will need to employ HList at some point, but I'm not entirely certain where. Will I need it at the very beginning, as constrains in the syntax so that only correct abstract terms can be built, or will I need it in on of the interpreters / compilers later? Günther