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In order to prevent the plugins from reporting physically wrong results the validity of actual parameter values are checked during the calculations (Figure 317). In case parameter values exceed the valid range, appropriate exceptions, e.g. RuntimeException, stops the plugin from doing further calculations.

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For this, each type of plugins provides the same method consistencyCheck() to perform the recommended checks: 

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• ConsistencyCheckContext: provides information about parameters relevant for the type of plugin.
• List<Object>:
  depending on the type of plugin it contains one or two objects which are either a Radio System or links which can be the system link, the interference link or the sensing link of generic systems. Corresponding details are described in the following sub-sections.
• Input
  the input parameters of the plugin
• Validator:
  provides the interface to the scenario check in returning the consistency check messages generated by the plugin

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• an antenna plugin (AP) can be applied only to a radio system, i.e. a generic system or a cellular system, hence the Origin is set to SYSTEM;
• a coverage radius plugin (CRP) can be applied only to a generic system, , hence the Origin is either SYSTEM or in case the system is the interferer INTERFERENCE_LINK;
• a propagation model plugin (PMP) can be applied to the system link, the interference link and the sensing link, , hence the origin can be SYSTEM or INTERFERENCE_LINK, depending on to which link the PMP is applied;
• an event processing plugin (EPP) and its post processing user interface (PPUI) cannot be applied to any of the scenario components, hence its ConsistencyCheckContext is set to NULL, except the Scenario which is not available for other plugins.

This default information can be replaced or extended if the plugin is nested, i.e. if the plugin is used as an input parameter of another plugin (annotation, see the previous section 14.3.1).

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In case you apply nested plugins it is highly recommended to check the validity of these nested plugins inside the consistency check of your 'parent' plugin. The below example of an EPP which uses a nested PMP wants only to show the principle of checking input parameters:

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