Graph Query by Example

Model-driven tools use model queries for many purposes, including validation of well-formedness rules, speci cation of derived features, and directing rule-based model transformation. Query languages such as graph patterns may facilitate capturing complex structural relationships between model elements. Specifying such queries, however, may prove di cult for engineers familiar with the concrete syntax only, not with the underlying abstract representation of the modeling language. The current paper presents an extension to the EMF-IncQuery model query tool that lets users point out, using familiar concrete syntax, an example of what the query results should look like, and automatically derive a graph query that nds other similar results.