In this paper we present a corpus representation format which unifies the representation of a wide range of dependency treebanks within a single model. This approach provides interoperability and reusability of annotated syntactic data which in turn extends its applicability within various research contexts. We demonstrate our approach by means of dependency treebanks of 11 languages. Further, we perform a comparative quantitative analysis of these treebanks in order to demonstrate the interoperability of our approach.