Chapter 8: The Mediator Catalog

8.1 -- Introduction: Hermes mediator catalog files (Hermes.cat) list the paths and descriptions of user accessible mediators. There can be two catalog files; One lists mediators available to all users and the other denotes user specific mediator files not commonly shared.

8.2 -- The System Mediator Catalog: Located in the same directory as the Hermes executable files, the primary, or system, mediator catalog lists mediator files available to all users. Facts declaring the mediators include the mediator file path and description (as in Fig. 8-1).

8.3 -- The User Mediator Catalog: The interactive Hermes interfaces (xHermes and Hermes) look for a secondary mediator catalog (Hermes.cat) located in the user's home directory. When present, Hermes appends these additional mediators to the current session. The user catalog file format, listed in Fig. 8-2, is identical to that of the primary mediator catalog. It provides the user an environment to maintain private, or experimental, mediators (Here we find the user working with two experimental mediators called MACS and nonlin).

NOTE: User declared mediators must not duplicate mediator names from the primary catalog. Each mediator name, such as inauguration.med or inventory.med, can be declared only once per session, even if mediator file paths differ.

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