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| [[File:Sugar-Network-diagram.png|200px|thumb|Sugar Network objects]]
| [[File:Sugar-Network-diagram.png|200px|thumb|Sugar Network objects]]
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'''Resource.layer'''
: 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.
: 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:
:* ''general'', the default layer for observers and Network objects; all users can see objects on this layer;
:* ''deleted'' Network objects' layer will be changed to {{Code|deleted}} after removing objects by users.
'''Context.type'''
: Context types:
:* ''application'', software application;
:* ''library'', software library;
:* ''activity'', Sugar activity;
:* ''article'', arbitrary content in a form of article.
'''Context.license'''
: Short license names. The licenses should conform with the [[Activity Library]] licensing [[Activity_Library/Editors/Policy/Licensing|policy]].
'''Implementation.stability'''
: Stability level of the Implementation. Values conform to [http://0install.net/interface-spec.html#id4016716 0install stability levels] and could be:
:* ''insecure'',
:* ''buggy'',
:* ''developer'',
:* ''testing'',
:* ''stable''.
'''Implementation.requires'''
: What Contexts the current one depends on. Value is a dictionary of:
"''<Context-GUID>''": {
"''constraints''": [{ # optional array of constrains
"''not-before''": "''<VERSION>''", # the lowest-numbered version that can be chosen
"''before''": "''<VERSION>''", # this version and all later versions are unsuitable
}],
"''importance''":
"''essential''|''recommended''", # dependency must be selected or no version is also an option
}
'''Notification.type'''
:* ''create'', object was created;
:* ''update'', object's properties were modified;
:* ''delete'', object was deleted (hidden);
:* ''vote'', object was voted/unvoted.