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Markers can be locked by the user who creates them
Case: I want to make a collaborative map of the city for multiple users (>10). The map is accessed from the link published on the website, so when a person added her mark she can also lock it. So others can not delete it, when they access the same map to add their marks. The map is embedded on the website and with more inputs from different users, we can see mount of marks growing and explore different locations added by the users.