@inproceedings {CSCS2002, title = {A Pattern-Based Constraint Language for Metamodels}, booktitle = {Proc. CSCS 2002: The Third Conference of PhD Students in Computer Science}, year = {2002}, month = {July 1{\textendash}4}, pages = {109}, address = {Szeged, Hungary}, author = {D{\'a}niel Varr{\'o}}, editor = {Tibor Csendes} }