[AG-TECH] NCSA Seminar April 1 on SGML/XML

Mary Ellen Michael memichae at ncsa.uiuc.edu
Mon Mar 24 17:45:05 CST 2003

Professor Allen Renear will be giving a presentation over the Access Grid 
as part of the NCSA Seminar Series. The link to the AGSchedule is 

If you would like to have your AG participate, join us an hour before the 
event (12:00 noon central standard time) when we will do a test cruise.

Tuesday, April 1, 2003
1:00 to 3:00 p.m. CST, Room E102A, SRO

Allen Renear and Dave Dubin
Electronic Publishing Research Group
Graduate School of Library and Information Science
University of Illinois at Urbana-Champaign

SGML/XML Document Authentication across (i) Meaning-Preserving Changes and
(ii) Changes in Context.

Detecting tampering with documents is an important part of information
security. Unfortunately no document authentication system actually does
document authentication -- they all do, in effect, bitstream
authentication. Because the bitstream-to-document relation is
many-to-many, not one-to-one, this both over- and under- reports possible
tampering, seriously damaging information protection efforts. Obviously
the solution is to extract the document from the bitstream and compare
documents, not bitstreams. But until recently it was not clear how to do
this, having no formal way to represent document semantics. SGML and XML
provide a machine-readable syntax for descriptive markup languages, but no
rigorous way to express the meaning of those languages. For over two years
the BECHAMEL project has been working on this problem. We have now have a
prototype formalization language and an environment (in object-oriented
Prolog) for using logic-based methods to interrogate document
abstractions. This work is based on the foundational theories of digital
documents, and can support and enhance many document-related activities --
document authentication is just one of these. The BECHAMEL Project is lead
by Michael Sperberg-McQueen (W3C/MIT), and hosted here at the UIUC GSLIS
Electronic Publishing Research Group.

Mary Ellen Michael, Ph.D.
Training Coordinator
Education, Outreach, and Training
National Center for Supercomputing Applications
University of Illinois at Urbana Champaign
152 Computing Applications Building
605 E. Springfield Avenue
Champaign, IL 61820
phone: 217-265-6387; fax 217-244-1987
memichae at ncsa.uiuc.edu
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