def METHOD_NAME():
    """
    Returns the list of valed naming schemes
    They are loaded from the easybuild.package.package_naming_scheme namespace
    """
    import_available_modules('easybuild.tools.package.package_naming_scheme')
    class_dict = dict([(x.__name__, x) for x in get_subclasses(PackageNamingScheme)])
    return class_dict