  In graph transformation, a conflict describes a situation where two
alternative transformations cannot be arbitrarily serialized. When enriching
graphs with attributes, existing conflict detection techniques typically report
a conflict whenever at least one of two transformations manipulates a shared
attribute. In this paper, we propose an improved, less conservative condition
for static conflict detection of graph transformation with attributes by
explicitly taking the semantics of the attribute operations into account. The
proposed technique is based on symbolic graphs, which extend the traditional
notion of graphs by logic formulas used for attribute handling. The approach is
proven complete, i.e., any potential conflict is guaranteed to be detected.
