Last updated 02 September 1998 14:30:40
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| An
Interpretive Filter Layer for Checking Object Structure
Hamilton Link, Sandia National Laboratories |
| One key aspect of integrated
network applications is the communications mechanism. In a network of heterogeneous
systems being used to achieve a variety of goals, an individual system may receive a large
amount of irrelevant information. Some of this information may be discarded based on its
class by a class-based filtering mechanism, but an application may still be forced to sift
through information that is malformed or otherwise inappropriate. A second layer of
defense must therefore be created which analyzes the structure or syntax of incoming
objects. This layer prevents the dispersion of syntax checking throughout the application
code, because after a module registers a filter, any objects it receives from the outside
have already been validated. Here we describe an interpretive filter class, explain how
the filter set is maintained and used, and demonstrate an extension of the filter class
for the application of message syntax checking for the Knowledge Query and Manipulation
Language (KQML).
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Last updated 02 September 1998 14:30:40