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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def validate_mapping(mapping):
 """ Validate a mapping configuration file against the relevant schema. """

    file_path = os.path.join(os.path.dirname(__file__),
                             'schemas', 'mapping.json')
    with open(file_path, 'r') as fh:
        validator = Draft4Validator(json.load(fh))
        validator.validate(mapping)
    return mapping