Split of terminology as separate section.

chapters/interface.tex

@@ -11,6 +11,7 @@ \chapter{Interface or Type Relationships}\label{interface-or-type-relationships}
 (\cref{interface-compatibility-or-subtyping} and \cref{plug-compatibility-or-restricted-subtyping}) between ''interfaces'' (\cref{the-concepts-of-type-interface-and-subtype}); this can
 also be viewed as sub-typing (\cref{the-concepts-of-type-interface-and-subtype}).
 
+\section{Interface Terminology}\label{interface-terminology}
 In this chapter, two kinds of terminology is used for identical concepts
 to get better understanding (e.g.\ by both engineers and computer
 scientists). A short summary of the terms is given in the following