Initializing help system before first use

# Using Inter-scenario Data Access

To access data from an external scenario, use the `AppInterface.get_scenario_data()` function.
First, define a class decorated using either the `ScenarioData()` or `AppConfig()` decorator. The attributes of this class represent the entities you want to read from the external scenario and are declared using `xpressinsight.data` annotations, as in this example:

    import xpressinsight as xi

    @xi.ScenarioData()
    class MyEntities:
        name: xi.data.Scalar(dtype=xi.string)
        users: xi.data.DataFrame(columns=[
            xi.data.Column('id', dtype=xi.string),
            xi.data.Column('name')
            xi.data.Column('age', dtype=xi.integer)])

For more information about these annotations, see Supported Types.
Note: Most arguments for the `xpressinsight.data.*` constructors are optional; missing information is filled in from the schema of the external scenario. For example, if you specify the expected type of an entity, the retrieved data is validated to ensure that it is of the specified type. But you can also omit the type, in which case that validation is skipped.
Now call `AppInterface.get_scenario_data()`, passing two arguments:

- A string identifying the path or ID of the external scenario (for syntax details, see Repository Paths).
- The class defining the entities to read.

    my_data = self.insight.get_scenario_data('/MyApp/MyScenario',
                                             MyEntities)

The function returns an instance of the class, with the attributes populated with the entity values retrieved from the external scenario.

Parent Topic Inter-scenario Data Access

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