mappings = {
    'dataset does not exist': 'DatasetNotFound',
    'dataset already exists': 'FilesystemExists',
    'invalid character': 'NameInvalid',
    'name is too long': 'NameTooLong',
    'parent does not exist': 'ParentNotFound', 
    'source and target pools differ': 'PoolsDiffer',
    'no such pool': 'PoolNotFound',
    'invalid property': 'PropertyInvalid',
}
