How to use the html5lib.ihatexml.InfosetFilter function in html5lib

def __init__(self, tree):
        if hasattr(tree, "getroot"):
            tree = Root(tree)
        elif isinstance(tree, list):
            tree = FragmentRoot(tree)
        _base.NonRecursiveTreeWalker.__init__(self, tree)
        self.filter = ihatexml.InfosetFilter()

def __init__(self, tree):
        if hasattr(tree, "getroot"):
            tree = Root(tree)
        elif isinstance(tree, list):
            tree = FragmentRoot(tree)
        _base.NonRecursiveTreeWalker.__init__(self, tree)
        self.filter = ihatexml.InfosetFilter()
    def getNodeDetails(self, node):

def testSerializer(element):
    rv = []
    finalText = None
    filter = ihatexml.InfosetFilter()
    def serializeElement(element, indent=0):
        if not hasattr(element, "tag"):
            if  hasattr(element, "getroot"):
                #Full tree case
                rv.append("#document")
                if element.docinfo.internalDTD:
                    if not (element.docinfo.public_id or 
                            element.docinfo.system_url):
                        dtd_str = ""%element.docinfo.root_name
                    else:
                        dtd_str = """"""%(
                            element.docinfo.root_name, 
                            element.docinfo.public_id,
                            element.docinfo.system_url)
                    rv.append("|%s%s"%(' '*(indent+2), dtd_str))
                next_element = element.getroot()

def __init__(self, namespaceHTMLElements, fullTree = False):
        builder = etree_builders.getETreeModule(etree, fullTree=fullTree)
        filter = self.filter = ihatexml.InfosetFilter()
        self.namespaceHTMLElements = namespaceHTMLElements

        class Attributes(dict):
            def __init__(self, element, value={}):
                self._element = element
                dict.__init__(self, value)
                for key, value in self.iteritems():
                    if isinstance(key, tuple):
                        name = "{%s}%s"%(key[2], filter.coerceAttribute(key[1]))
                    else:
                        name = filter.coerceAttribute(key)
                    self._element._element.attrib[name] = value

            def __setitem__(self, key, value):
                dict.__setitem__(self, key, value)
                if isinstance(key, tuple):

def tostring(element):
        """Serialize an element and its child nodes to a string"""
        rv = []
        finalText = None
        filter = ihatexml.InfosetFilter()
        def serializeElement(element):
            if type(element) == type(ElementTree.ElementTree):
                element = element.getroot()
            
            if element.tag == "":
                if element.get("publicId") or element.get("systemId"):
                    publicId = element.get("publicId") or ""
                    systemId = element.get("systemId") or ""
                    rv.append( """"""%(
                            element.text, publicId, systemId))
                else:     
                    rv.append(""%(element.text,))
            elif element.tag == "":
                if element.text:
                    rv.append(element.text)
                if element.tail:

def tostring(element):
        """Serialize an element and its child nodes to a string"""
        rv = []
        finalText = None
        filter = ihatexml.InfosetFilter()
        def serializeElement(element):
            if type(element) == type(ElementTree.ElementTree):
                element = element.getroot()
            
            if element.tag == "":
                if element.get("publicId") or element.get("systemId"):
                    publicId = element.get("publicId") or ""
                    systemId = element.get("systemId") or ""
                    rv.append( """"""%(
                            element.text, publicId, systemId))
                else:     
                    rv.append(""%(element.text,))
            elif element.tag == "":
                if element.text:
                    rv.append(element.text)
                if element.tail:

def tostring(element):
        """Serialize an element and its child nodes to a string"""
        rv = []
        finalText = None
        filter = ihatexml.InfosetFilter()
        def serializeElement(element):
            if type(element) == type(ElementTree.ElementTree):
                element = element.getroot()
            
            if element.tag == "":
                if element.get("publicId") or element.get("systemId"):
                    publicId = element.get("publicId") or ""
                    systemId = element.get("systemId") or ""
                    rv.append( """"""%(
                            element.text, publicId, systemId))
                else:     
                    rv.append(""%(element.text,))
            elif element.tag == "":
                if element.text:
                    rv.append(element.text)
                if element.tail:

def tostring(element):
        """Serialize an element and its child nodes to a string"""
        rv = []
        finalText = None
        filter = ihatexml.InfosetFilter()
        def serializeElement(element):
            if type(element) == type(ElementTree.ElementTree):
                element = element.getroot()
            
            if element.tag == "":
                if element.get("publicId") or element.get("systemId"):
                    publicId = element.get("publicId") or ""
                    systemId = element.get("systemId") or ""
                    rv.append( """"""%(
                            element.text, publicId, systemId))
                else:     
                    rv.append(""%(element.text,))
            elif element.tag == "":
                if element.text:
                    rv.append(element.text)
                if element.tail:

def __init__(self, tree):
        if hasattr(tree, "getroot"):
            tree = Root(tree)
        elif isinstance(tree, list):
            tree = FragmentRoot(tree)
        _base.NonRecursiveTreeWalker.__init__(self, tree)
        self.filter = ihatexml.InfosetFilter()
    def getNodeDetails(self, node):