def METHOD_NAME(
    dist_name: str,
    user: bool = False,
    home: typing.Optional[str] = None,
    root: typing.Optional[str] = None,
    isolated: bool = False,
    prefix: typing.Optional[str] = None,
) -> Scheme:
    """
    Get the "scheme" corresponding to the input parameters.
    :param dist_name: the name of the package to retrieve the scheme for, used
        in the headers scheme path
    :param user: indicates to use the "user" scheme
    :param home: indicates to use the "home" scheme
    :param root: root under which other directories are re-based
    :param isolated: ignored, but kept for distutils compatibility (where
        this controls whether the user-site pydistutils.cfg is honored)
    :param prefix: indicates to use the "prefix" scheme and provides the
        base directory for the same
    """
    if user and prefix:
        raise InvalidSchemeCombination("--user", "--prefix")
    if home and prefix:
        raise InvalidSchemeCombination("--home", "--prefix")
    if home is not None:
        scheme_name = _infer_home()
    elif user:
        scheme_name = _infer_user()
    else:
        scheme_name = _infer_prefix()
    # Special case: When installing into a custom prefix, use posix_prefix
    # instead of osx_framework_library. See _should_use_osx_framework_prefix()
    # docstring for details.
    if prefix is not None and scheme_name == "osx_framework_library":
        scheme_name = "posix_prefix"
    if home is not None:
        variables = {k: home for k in _HOME_KEYS}
    elif prefix is not None:
        variables = {k: prefix for k in _HOME_KEYS}
    else:
        variables = {}
    paths = sysconfig.get_paths(scheme=scheme_name, vars=variables)
    # Logic here is very arbitrary, we're doing it for compatibility, don't ask.
    # 1. Pip historically uses a special header path in virtual environments.
    # 2. If the distribution name is not known, distutils uses 'UNKNOWN'. We
    #    only do the same when not running in a virtual environment because
    #    pip's historical header path logic (see point 1) did not do this.
    if running_under_virtualenv():
        if user:
            base = variables.get("userbase", sys.prefix)
        else:
            base = variables.get("base", sys.prefix)
        python_xy = f"python{get_major_minor_version()}"
        paths["include"] = os.path.join(base, "include", "site", python_xy)
    elif not dist_name:
        dist_name = "UNKNOWN"
    scheme = Scheme(
        platlib=paths["platlib"],
        purelib=paths["purelib"],
        headers=os.path.join(paths["include"], dist_name),
        scripts=paths["scripts"],
        data=paths["data"],
    )
    if root is not None:
        for key in SCHEME_KEYS:
            value = change_root(root, getattr(scheme, key))
            setattr(scheme, key, value)
    return scheme