Building a Large Syntactically-Annotated Corpus of Vietnamese

Treebank is an important resource for both research and application of natural language processing. For Vietnamese, we still lack of such kind of corpora. This paper presents up-to-date results of a project for Vietnamese treebank con-struction. Since Vietnamese is an isolated language and has no word delimiter, there are many ambiguities in sentence analysis. We systematically applied a lot of linguistic techniques to handle such ambiguities. Annotators are supported by automatic-labeling tools and a tree-editor tool. Raw texts are extracted from Youth, an online Vietnamese daily newspaper. The current annotation agreement is around 90 percent.