Pragmatics and Open Problems
for Inter-schema Constraint Theory
May 2006
Arnon Rosenthal, The MITRE Corporation
Len Seligman, The MITRE Corporation
ABSTRACT
We consider pragmatic issues in applying constraint-based
theories (such as that developed for data exchange) to a
variety of problems. We identify disconnects between
theoreticians and tool developers, and propose principles
for creating problem units that are appropriate for tools.
Our Downstream Principle then explains why automated
schema mapping is a prerequisite to transitioning schemamatching
prototypes. Next, we compare concerns,
strengths, and weaknesses of database and AI approaches
to data exchange. Finally, we discuss how constrained
update by business processes is a central difficulty in
maintaining n-tier applications, and compare the
challenges with data exchange and conventional view
update.
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