Every OBO ontology contains a set of namespaces. Terms and relationships in the ontology can be assigned to one of the namespaces in that set (see An Introduction to OBO Ontologies, Text Editing, and The Parent Plugin for more information on how to assign entities to namespaces).
The built-in Namespace Manager Plugin allows users to manage the set of available namespaces. To access the Namespace Manager Plugin, choose "Namespace Manager Plugin" from the "Plugin" menu:
The Namespace Manager Plugin window will appear:
Any changes made in the Namespace Manager Plugin are not saved until the "Save Changes" button is clicked. If changes are made and the window is closed, the changes will not be saved. To revert to the last committed version of the namespace set, click the "Revert" button.
To edit an existing namespace, click the namespace to edit in the list on the left. The namespace editor panel will appear:
Namespaces have only one editable attribute: their id. To change the namespace id, click the namespace id in the text field and type a new id.
To delete an existing namespace, click the namespace to delete in the list on the left. Click the Del button to remove the namespace.
Note that a namespace that is assigned to a term or relationship cannot be deleted. If a namespace is deleted that is still in use, a warning will appear when the "Save Changes" button is pressed. If a namespace must be deleted, first search the ontology to make sure that the namespace is not in use.
To add a new namespace, click the "Add" button. A new namespace will be created with the default id "<new namespace id>":
Edit the id as described above.