This namespace is dedicated to classes and properties produced by a particular research projects. This is just a provisional placeholder to be used by any project willing to enter the communitiy, import the own ontology (classes, properties, etc.), mapping them to the existing ontologies, etc.
In it's own namespace, a project can also create additional labels and text properties for classes of standard ontologies, e.g. the CIDOC-CRM, to be used in the project's distributed application.
This is the root namespace, it is not allowed to associate directly to it classes, properties, etc.