| Comment | In the case you described, it would actually not be allowed to put a Data unit without tha appropriate way of selecting a single instance. However, WebML provides the "non-deterministic" semantics for any case in which a single element out of a list must be shown.
Note that this is not a good way to obtain random visualization of objects, since typically implementations (eg, WebRatio) will realize "non determinism" in a deterministic way. In your example, what will happen is that your data unit will always show the same object (the first extracted by the query).
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