This problem has two primary components:   <a href = "http://cs-tr.cs.cornell.edu:80/TR/CORNELLCS:TR94-1452?abstract">segmentation</a> (dividing the document into logical pieces) and <a href = "http://www.cs.cornell.edu/Info/People/summers/classify.html">classification</a> (categorizing the pieces). It also raises the questions of evaluation (previous work differs in descriptions of the correct hierarchy),  <a href = "http://www.cs.cornell.edu/Info/People/summers/structures.html">types</a> of logical structures, and theoretical limitations.</p>
