Klíčová slova:
visual modeling, syntax, semantics, language, tools
Anotace:
Nowadays, we can meet computers even in fields where it was not usual and in all these disciplines we can meet with visual models. They allow user simpler control and more user friendly environment for programming, setting up and using computing systems than the textual one. Since visual models describe system instructions or operations, they need precise notation and meaning definition for all their elements. The objective of this paper is to clarify some notions, especially syntax and semantics. We explain why are they important, why we need their precise definition and clarify distinction between them.