The model refers to the following additional information:
The model refers to the following additional information:
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==== Sugar Network layers ====
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This is an attempt to generalize the idea of [http://groups.google.com/group/sugar-network/browse_thread/thread/4cad05ec801f364c user/resource levels] with idea that objects should not be removed from the Network immediately (only hidden, and permanently removed by Network administrators). So, every resource is associated with a layer, i.e., it might be visible for observers only if they requested this layer and have permissions to see it.
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For now, implemented only the following list of layers, but it might be reused for [http://groups.google.com/group/sugar-network/msg/f5a1b4d78494a5d3 teachers related workflows] later:
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* {{Code|general}}, the default layer for observers and Network objects; all users can see objects on this layer;
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* {{Code|deleted}}, Network objects' layer will be changed to {{Code|deleted}} after removing objects by users.
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==== Events types ====
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* {{Code|create}}<br>object was created;
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* {{Code|update}}<br>object's properties were modified;
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* {{Code|delete}}<br>object was deleted (hidden);
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* {{Code|vote}}<br>object was voted/unvoted.
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==== Licences ====
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Short license names. The licenses should conform with the [[Activity Library]] licensing [[Activity_Library/Editors/Policy/Licensing|policy]].