Concept Maps are very effective for language-free expression and communication of concepts visually. The fundamental structures, which are not all graphic, are also very elegant for encoding knowledge for machine processing.
The building blocks of knowledge (Nodes and Links) are NOT sufficiently "expressive & precise". HyperPlex fills this need. See the PPT by that name in https://www.slideshare.net/putchavn
Both the concepts are explained with examples.
Good for general use and a prerequisite for knowing what is knowledge and how to represent it. Leave a comment.