Rather than expressing sentences in sequences of characters, visual programming languages allow programs to be expressed in visual sentences in a multi-dimensional fashion. As noted by Reker and Schuir (1996), the physical layout and the meaning of a diagram are two important aspects of a visual sentence. A spatial relations graph (SRG) specifies spatial relationships between pictorial objects while an abstract syntax graph (ASG) provides structural information in a succinct form. Consequently in their approach, a visual sentence is specified through two intermediate graphs. One is geared toward visualization, and the other toward interpretation (Rekerand Schuir 1996).
KeywordsSpatial Relationship Pattern Sequence Visual Object Spatial Object Spatial Specification
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