Toward a Multi-Representation Persian Treebank

In this paper, we describe our project of building a phrase structure treebank for Persian. The treebank consists of approximately 30000 sentences. With the help of this treebank, the researcher can investigate syntactic phenomena, extract grammars, train and test parsers, etc. In addition to these motivations, as another advantage of it we can refer to the fact that the sentences of this treebank are selected from an available dependency treebank. So the final treebank has two syntactic representations: phrase structure and dependency structure. The treebank is built using a bootstrapping approach, which converts a dependency structure tree to a phrase structure tree and the annotations are corrected manually. Using the new phrase structure treebank, we train models for constituency parsers. The treebank is freely available for educational purposes¹.