Abstract. Recent work in the field of middleware technology proposes semanticsaware tuplespaces as a tool for coping with the scalability, heterogeneity and dynamism issues arising in distributed environments such as the (Semantic) Web. The fact that (Semantic) Web services communicate by synchronous message exchanges initiated triplespace computing. The aim was to bring the Web’s “persistently publish and read” paradigm to service computing. Based on experiences with ontologies in traditional middleware we argue that ontology-driven management will be a major asset of semantic tuplespaces compared to traditional ones. In this research we look at ontology-based metadata to enhance semantic space infrastructures to become reflective middleware.1