kUTExportedTypeDeclarationsKey
kUTImportedTypeDeclarationsKey
kUTTagClassFilenameExtension
kUTTagClassMIMEType
kUTTagClassNSPboardType
kUTTagClassOSType
kUTTypeConformsToKey
kUTTypeDescriptionKey
kUTTypeIconFileKey
kUTTypeIdentifierKey
kUTTypeReferenceURLKey
kUTTypeTagSpecificationKey
kUTTypeVersionKey