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Erschienen in:
2007 | OriginalPaper | Buchkapitel
Spatial Specification
Erschienen in: Visual Languages and Applications
Verlag: Springer US
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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).