A predicate-based approach to defining visual language syntax.

Jörn W. Janneck Robert Esser A predicate-based approach to defining visual language syntax. 40-47 2001 conf/vl/2001 HCC http://csdl.computer.org/comp/proceedings/hcc/2001/0474/00/04740040abs.htm db/conf/vl/hcc2001.html#JanneckE01