Just a quick note to mention a wonderful book I recently encountered
that is relevant to overlap issues.
"Coherence In Natural Language: Data Structures and Applications" by
Florian Wolf and Edward Gibson.
MIT Press, 2006.
You can view the thesis that morphed into the book at:
The authors conclude that trees (even augmented trees) are inappropriate
for representation of discourse analysis.
They created a corpus of texts and measured the number of nodes with
multiple parents (+ 44%) and investigated the nature of the parentage to
see if it could be otherwise resolved (no). There are a number of useful
references to other literatures on trees and discourse analysis.
Highly recommended to anyone interested in overlap issues in markup.
Hope everyone is looking forward to a great weekend!
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Chair, V1 - Text Processing: Office and Publishing Systems Interface
Co-Editor, ISO 13250, Topic Maps -- Reference Model
Member, Text Encoding Initiative Board of Directors, 2003-2005
Topic Maps: Human, not artificial, intelligence at work!