def _create_clang_hdrs_key(pkg_name, target_name):
    """Returns a key that is used for clang headers dictionaries.

    Args:
        pkg_name: A `string` that is the name of the Swift package.
        target_name: A `string` that is the name of the target.

    Returns:
        A `string` representing the combined items.
    """
    return "%s/%s" % (pkg_name, target_name)