How to use the cairosvg.url.parse_url function in CairoSVG

def text(surface, node, draw_as_text=False):
    """Draw a text ``node``."""
    font_family = (
        (node.get('font-family') or 'sans-serif').split(',')[0].strip('"\' '))
    font_style = getattr(
        cairo, ('font_slant_{}'.format(node.get('font-style')).upper()),
        cairo.FONT_SLANT_NORMAL)
    font_weight = getattr(
        cairo, ('font_weight_{}'.format(node.get('font-weight')).upper()),
        cairo.FONT_WEIGHT_NORMAL)
    surface.context.select_font_face(font_family, font_style, font_weight)
    surface.context.set_font_size(surface.font_size)
    ascent, descent, _, max_x_advance, max_y_advance = (
        surface.context.font_extents())

    text_path_href = parse_url(node.get_href() or node.parent.get_href() or '')
    if text_path_href.fragment:
        text_path = surface.paths.get(text_path_href.fragment)
    else:
        text_path = None
    letter_spacing = size(surface, node.get('letter-spacing'))
    x_bearing, y_bearing, width, height = (
        surface.context.text_extents(node.text)[:4])

    x, y, dx, dy, rotate = [], [], [], [], [0]
    if 'x' in node:
        x = [size(surface, i, 'x')
             for i in normalize(node['x']).strip().split(' ')]
    if 'y' in node:
        y = [size(surface, i, 'y')
             for i in normalize(node['y']).strip().split(' ')]
    if 'dx' in node:

def use(surface, node):
    """Draw the content of another SVG node."""
    surface.context.save()
    surface.context.translate(
        size(surface, node.get('x'), 'x'), size(surface, node.get('y'), 'y'))
    if 'x' in node:
        del node['x']
    if 'y' in node:
        del node['y']
    if 'viewBox' in node:
        del node['viewBox']
    if 'mask' in node:
        del node['mask']
    href = parse_url(node.get_href()).geturl()
    tree = Tree(
        url=href, url_fetcher=node.url_fetcher, parent=node,
        tree_cache=surface.tree_cache, unsafe=node.unsafe)

    if not match_features(tree.xml_tree):
        surface.context.restore()
        return

    if tree.tag in ('svg', 'symbol'):
        # Explicitely specified
        # http://www.w3.org/TR/SVG11/struct.html#UseElement
        tree.tag = 'svg'
        if 'width' in node and 'height' in node:
            tree['width'], tree['height'] = node['width'], node['height']

    surface.draw(tree)

def paint(value):
    """Extract from value an uri and a color.

    See http://www.w3.org/TR/SVG/painting.html#SpecifyingPaint

    """
    if not value:
        return None, None

    value = value.strip()
    match = PAINT_URL.search(value)
    if match:
        source = parse_url(match.group(1)).fragment
        color = match.group(2) or None
    else:
        source = None
        color = value or None

    return (source, color)

preserve = self.get(space) == 'preserve'
        self.text = handle_white_spaces(element.etree_element.text, preserve)
        if trailing_space and not preserve:
            self.text = self.text.lstrip(' ')
        original_rotate = rotations(self)
        rotate = list(original_rotate)
        if original_rotate:
            pop_rotation(self, original_rotate, rotate)
        if self.text:
            trailing_space = self.text.endswith(' ')
        for child_element in element.iter_children():
            child = child_element.etree_element
            if child.tag in ('{http://www.w3.org/2000/svg}tref', 'tref'):
                href = child.get(
                    '{http://www.w3.org/1999/xlink}href', child.get('href'))
                url = parse_url(href).geturl()
                child_tree = Tree(
                    url=url, url_fetcher=self.url_fetcher, parent=self,
                    unsafe=self.unsafe)
                child_tree.clear()
                child_tree.update(self)
                child_node = Node(
                    child_element, self.style, self.url_fetcher,
                    parent=child_tree, parent_children=True,
                    unsafe=self.unsafe)
                child_node.tag = 'tspan'
                # Retrieve the referenced node and get its flattened text
                # and remove the node children.
                child = child_tree.xml_tree
                child.text = flatten(child)
                child_element = cssselect2.ElementWrapper.from_xml_root(child)
            else:

def draw_markers(surface, node):
    """Draw the markers attached to a path ``node``."""
    if not getattr(node, 'vertices', None):
        return

    markers = {}
    common_marker = parse_url(node.get('marker', '')).fragment
    for position in ('start', 'mid', 'end'):
        attribute = 'marker-{}'.format(position)
        if attribute in node:
            markers[position] = parse_url(node[attribute]).fragment
        else:
            markers[position] = common_marker

    angle1, angle2 = None, None
    position = 'start'

    while node.vertices:
        # Calculate position and angle
        point = node.vertices.pop(0)
        angles = node.vertices.pop(0) if node.vertices else None
        if angles:
            if position == 'start':

def __new__(cls, **kwargs):
        tree_cache = kwargs.get('tree_cache')
        if tree_cache and kwargs.get('url'):
            parsed_url = parse_url(kwargs['url'])
            element_id = parsed_url.fragment
            parent = kwargs.get('parent')
            unsafe = kwargs.get('unsafe')
            if any(parsed_url[:-1]):
                url = urlunparse(parsed_url[:-1] + ('',))
            elif parent:
                url = parent.url
            else:
                url = None
            if url and (url, element_id) in tree_cache:
                cached_tree = tree_cache[(url, element_id)]
                new_tree = Node(
                    cached_tree.element, cached_tree.style,
                    cached_tree.url_fetcher, parent, unsafe=unsafe)
                new_tree.xml_tree = cached_tree.xml_tree
                new_tree.url = url

parent_children = kwargs.get('parent_children')
        tree_cache = kwargs.get('tree_cache')
        element_id = None

        self.url_fetcher = kwargs.get('url_fetcher', fetch)

        if bytestring is not None:
            self.url = url
        elif file_obj is not None:
            bytestring = file_obj.read()
            self.url = getattr(file_obj, 'name', None)
            if self.url == '':
                self.url = None
        elif url is not None:
            parent_url = parent.url if parent else None
            parsed_url = parse_url(url, parent_url)
            if parsed_url.fragment:
                self.url = urlunparse(parsed_url[:-1] + ('',))
                element_id = parsed_url.fragment
            else:
                self.url = parsed_url.geturl()
                element_id = None
            self.url = self.url or None
        else:
            raise TypeError(
                'No input. Use one of bytestring, file_obj or url.')
        self_is_parent = (
            (parent and self.url == parent.url) or
            (url and url.startswith('#') and not self.url))
        if self_is_parent:
            root_parent = parent
            while root_parent.parent is not None:

if len(rect_values) == 4:
            top = size(self, rect_values[0], 'y')
            right = size(self, rect_values[1], 'x')
            bottom = size(self, rect_values[2], 'y')
            left = size(self, rect_values[3], 'x')
            x = size(self, node.get('x'), 'x')
            y = size(self, node.get('y'), 'y')
            width = size(self, node.get('width'), 'x')
            height = size(self, node.get('height'), 'y')
            self.context.save()
            self.context.translate(x, y)
            self.context.rectangle(
                left, top, width - left - right, height - top - bottom)
            self.context.restore()
            self.context.clip()
        clip_path = parse_url(node.get('clip-path')).fragment
        if clip_path:
            path = self.paths.get(clip_path)
            if path:
                self.context.save()
                if path.get('clipPathUnits') == 'objectBoundingBox':
                    x = size(self, node.get('x'), 'x')
                    y = size(self, node.get('y'), 'y')
                    width = size(self, node.get('width'), 'x')
                    height = size(self, node.get('height'), 'y')
                    self.context.translate(x, y)
                    self.context.scale(width, height)
                path.tag = 'g'
                self.stroke_and_fill = False
                self.draw(path)
                self.stroke_and_fill = True
                self.context.restore()

def draw_markers(surface, node):
    """Draw the markers attached to a path ``node``."""
    if not getattr(node, 'vertices', None):
        return

    markers = {}
    common_marker = parse_url(node.get('marker', '')).fragment
    for position in ('start', 'mid', 'end'):
        attribute = 'marker-{}'.format(position)
        if attribute in node:
            markers[position] = parse_url(node[attribute]).fragment
        else:
            markers[position] = common_marker

    angle1, angle2 = None, None
    position = 'start'

    while node.vertices:
        # Calculate position and angle
        point = node.vertices.pop(0)
        angles = node.vertices.pop(0) if node.vertices else None
        if angles:
            if position == 'start':
                angle = pi - angles[0]
            else:
                angle = (angle2 + pi - angles[0]) / 2
            angle1, angle2 = angles