  This article aims to provide a unified and technical approach to semantic
information, communication, and their interplay through the lens of
probabilistic logic. To this end, on top of the existing technical
communication (TC) layer, we additionally introduce a semantic communication
(SC) layer that exchanges logically meaningful clauses in knowledge bases. To
make these SC and TC layers interact, we propose various measures based on the
entropy of a clause in a knowledge base. These measures allow us to delineate
various technical issues on SC such as a message selection problem for
improving the knowledge at a receiver. Extending this, we showcase selected
examples in which SC and TC layers interact with each other while taking into
account constraints on physical channels.
