Lambda the Ultimate

This paper by Josh Shinavier presents Ripple, a concatenative, multivalued, pipeline language for RDF metaprogramming.

From the Abstract:

The idea of linked programs, or procedural RDF metadata, has not been deeply explored. This paper introduces a dedicated scripting language for linked data, called Ripple, whose programs both operate upon and reside in RDF graphs. Ripple is a variation on the concatenative theme of functional, stack-oriented languages such as Joy and Factor, and takes a multivalued, pipeline approach to query composition. The Java implementation includes a query API, an extensible library of primitive functions, and an interactive command-line interpreter.