RavenclawDev: returning frame from a back end

[Svetlana Stenchikova]

Hi,

How should a  back-end function of a ravenclaw dialog manager format a
frame?

For example,  I am expecting to get a "error" parameter from:

CALL("java_be.add_event <event_add error>backend_error")

backend_error is declared as:
BOOL_SYSTEM_CONCEPT(backend_error)

In the java back-end:

public GFrame serverOpAddEvent(GFrame f) {
...

    GFrame eventAdded = new Clause("event_add");

    eventAdded.setProperty("error", "false");

    return eventAdded;
}


But the backend_error in DM does not get initialized.

Is there a particular way that the return GFrame from the backend server has
to be generated?

Thank you,
Svetlana
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