Ontology-based Annotation and Indexing for Vietnamese Text Document

In this paper, the ontology-based annotation method for Vietnamese text document and a method of indexing annotated document are presented. The annotation method aims at annotating a text document in order to decrease the amount of comparing operations and increase the accuracy in the retrieval tasks. To accomplish this purpose, the kernel phrase concept is proposed to transform the groups of synonymy phrases into an only phrase which has the same meaning to the synonymy phrases. The transforming from a phrase to its kernel phrase is based on an ontology of Vietnamese words according to a different language model. This paper is focused on the annotation method using ontology to identify kernel phrases in a document. Some problems of Vietnamese language related to the annotation method are also presented.