-All OBO ontologies should use PURLs that have a base URL within their allocated space (in CURIE form these would be prefixed with their IDSPACE). IDSPACEs within the OBO library are unique for a given project and are chosen not to conflict with prefix for other resources. Although IDSPACEs are case-sensitive, there will never be more than one IDSPACEs that are the same when compared in a case-insensitive manner. Therefore, although "GO" and "go", "Go" and "gO" are different IDSPACEs, the IDSPACE "go", "Go" and "gO" will not be used as "GO" has already been allocated.
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