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The fragment of the SPDL document on previous page defines two roles: creator and observer.
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We suppose that the data were produced by scientists from Syracuse therefore the role of the creator is assigned to them. Two other groups have the observer roles.
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The shared object `viewer' behaves in different way depending on the role of the user. The user that has the role of the creator (must belong to `syracuse' group) obtains access to the viewer interface with more functionality. This extended functionality enables presenting the gathered material to the observers.
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On the other hand, observers obtain access to the simpler interface suitable only for viewing the content presented by the creators.
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The shared object `chat' does not have this distinction. All users (that belong to the previously declared groups) can access it in the same way without any limitations.
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