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Complex Event Processing (CEP) is one technique used to the handling dataflows. It allows pre-establishing conditions through rules and firing eventswhen certain patterns are found in the data flows. Because the rules fordefining such patterns are expressed with specific languages, users of thesetechnologies must understand the underlying expression syntax. To reduce thecomplexity of writing CEP rules, some researchers are employing Domain SpecificModeling Language (DSML) to provide modelling through visual tools. However,existing approaches are ignoring some user design techniques that facilitateusability. Thus, resulting tools eventually has become more complexes forhandling CEP than the conventional usage. Also, research on DSML toolstargeting CEP does not present any evaluation around usability. This articleproposes a DSML combined with visual notations techniques to create CEP ruleswith a more intuitive development model adapted for the non-expert user needs.The resulting tool was evaluated by non-expert users that were capable ofeasily creating CEP rules without prior knowledge of the underlying expressionlanguage.

A Semiotics-inspired Domain-Specific Modeling Language for Complex Event Processing Rules