The scenario definition language defines scenario definitions, which describe message flows between a number of network nodes. "Roles" represent the network nodes, and "dialogs" represent the network dialogs between roles.

Scenario definitions look like this:

callBarringScenario (FORMAT 1.0) {
  (ROLES)   { alice; bob; }
  (DIALOGS) { alice-bob (ROLE_A alice, ROLE_B bob, SCHEMA callControl, VERSION 1.1); }

  InitialDP (DIALOG alice-bob, DIRECTION A_TO_B) {
    callingPartyNumber "123456";

This includes:

  • the top-level element — the scenario itself, which names the scenario, and must specify the format of the scenario definition (currently, the only option is (FORMAT 1.0))

  • roles — defined as children of a (ROLES) element under the scenario

  • dialogs — defined as children of a (DIALOGS) element. The DIALOGS element requires four attributes:

    • The order of the roles is significant if the schema is non-symmetric.

    • The SCHEMA attribute must name a known scenario schema. The Scenario Simulator uses the schema to validate and give meaning to the messages and fields the scenario defines.

    • The VERSION specifies the version of the protocol schema.

  • remaining child elements — define the messages.

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