A Case Study in Treebank Collaboration and Comparison: Accusativus cum Infinitivo and Subordination in Latin

We describe here a collaboration between two separate treebank projects annotating data for the same language (Latin). By working together to create a common standard for the annotation of Latin syntax and sharing our annotated data as it is created, we are each able to rely on the resources and expertise of the other while also ensuring that our data will be compatible in the future. is compatibility allows us to conduct diachronic studies involving both datasets, and we add our results to an ongoing discussion of one such issue, the gradual replacement of the Accusativus cum Infinitivo construction in Latin with subordinate clauses headed by conjunctions such as quod and quia.