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Trigg: Ph.D. thesis
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"A Network-Based Approach to Text Handling
for the Online Scientific Community
Randall Trigg
Department of Computer Science
University of Maryland
College Park MD 20742
November 1983
Ph.D. dissertation
University of Maryland Technical Report, TR-1346
University Microfilms #8429934
Copyright © Randall H. Trigg
This research was supported by the National Science Foundation, the Air Force Office
of
Scientific Research and NASA Goddard Space Flight Center under grant MCS-
8219507,
AFOSR-82-0303 and NAS-25764 respectively.
CHAPTER 4:
A Taxonomy of Link Types
One of the most important features of the Textnet approach is the extraction of semantic
content from text by making the relationships between nodes explicit. This is accomplished
by
joining the nodes with typed links. In this chapter, we outline a proposed taxonomy of
primitive
link types.
We should first note that there is an alternative to such a fixed set of link types. One can
imagine a facility whereby users are allowed to define new link types. Though this does
provide
for extensibility, it seems unlikely that scientific writing is evolving at such a rate that new
link
types are regularly discovered. Rather, we feel that the set of link types is fairly static. For
this
reason and the following practical considerations, we decided not to provide such a facility.
(1) Explosion of link types: Without restrictions, users could flood the system with
unmanageably many new link types.
(2) Reader confusion: It seems unlikely that the choice of link type name by the creator
would
be sufficient to convey the meaning of this new link to future readers. This in turn could
lead to misuse of the new link type by later critiquers.
(3) System co"
....
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