Text document annotation methods: Stat of art

A huge number of documents are available that may cause information overload problems. Text document annotation provides a solution to such type of problems. Text annotation is the process of attaching comments, notes, or explanations to text documents. From a technical point of view, annotations are usually seen as metadata, as they give additional information about an existing piece of data. Annotations facilitate the task of finding the document topic and assist the reader to quickly overview and understand document. In this paper, we study different methods of text document annotation and comparisons among different methods are shown indicating advantages and disadvantages of each method used in annotation.