This paper proposes a guideline to determine Thai elementary discourse units (EDUs) based on rhetorical structure theory. Carson and Marcu's (2001) guideline for segmenting English EDUs is modified to propose a suitable guideline for segmenting EDUs in Thai. The proposed principles are used in tagging EDUs for constructing a corpus of discourse tree structures. It can also be used as the basis for implementing automatic Thai EDU segmentation. The problems of determining Thai EDUs both manually and automatically are also explored and discussed in this paper.
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