Building Graphical Knowledge Representation Languages - From Informal to Interoperable Executable Models

We summarize the evolution of a Graphic Knowledge representation language developed at our research center that has served in many applications throughout the years and, more recently to help develop the TELOS system. We first underline the theoretical research on which the language is built. Then we address the question of standardizing a knowledge modeling tool, first designed as an informal thinking aid. One standard specialization of the language is embedded in a tool to produce OWL models totally graphically. Another one enables users to produce standard IMS-LD multi-actor learning scenarios or workflows. The most recent evolution is the TELOS function editor that generalizes both IMS-LD models and business workflow models. We conclude by discussing the properties of the representation language that have benn found most useful