2. Overview of Thai Text Indexing
Indexing Thai text documents is an essential process in
Thai information retrieval [4], [5], [6]. Indexing is a process
that creates the necessary data structure, known as indices,
for mapping keywords (also called indexing terms) to those
text docu-ments containing the keywords. In an information
retrieval system, it is necessary to index a text document first
to enable efficient lookup and retrieval of the text document
later. A number of data structures are used in indexing Thai
text documents. They include an inverted index, also called
inverted file, and suffix array. Inverted index is currently