def add_stylesheet_links(container, name, text): root = container.parse_xhtml(text, name) head = root.xpath('//*[local-name() = "head"]') if not head: return head = head[0] sheets = tuple(container.manifest_items_of_type(lambda mt: mt in OEB_STYLES)) if not sheets: return for sname in sheets: link = head.makeelement(XHTML('link'), type='text/css', rel='stylesheet', href=container.name_to_href(sname, name)) head.append(link) pretty_xml_tree(head) return serialize(root, 'text/html')