1 Introduction. - 2 A Survey of Visual Language Specification and Recognition. - 3 Visual Language Theory: Towards a Human Computer Interaction Perspective. - 4 The CCMG Visual Language Hierarchy. - 5 Positional Grammars: A Formalism for LR-Like Parsing of Visual Languages. - 6 Relational Grammars: Theory and Practice in a Visual Language Interface for Process Modeling. - 7 Relation Grammars: A Formalism for Syntactic and Semantic Analysis of Visual Languages. - 8 How to Represent a Visual Specification. - 9 A Fully Formalized Theory for Describing Visual Notations. - 10 On the Isomorphism or Lack of It of Representations. - 11 A Syntax-Directed Approach to Picture Semantics. - 12 Input and Output for Specified Visual Languages. - 13 Specification of Visual Languages as Means for Interaction. Language: English