How to use the adal.xmlutil.xpath_find function in adal

def _select_username_password_polices(self, xpath):

        policies = {}
        username_token_nodes = xmlutil.xpath_find(self._dom, xpath)
        if not username_token_nodes:
            self._log.warn("No username token policy nodes found.")
            return

        for node in username_token_nodes:
            policy_node = self._parents[self._parents[self._parents[self._parents[self._parents[self._parents[self._parents[node]]]]]]]
            policy_id = self._check_policy(policy_node)
            if policy_id:
                id_ref = '#' + policy_id
                policies[id_ref] = {policy_id:id_ref}

        return policies if policies else None

def _check_policy(self, policy_node):
        policy_id = policy_node.attrib["{{{}}}Id".format(XmlNamespaces.namespaces['wsu'])]
        
        # Try with Transport Binding XPath
        transport_binding_nodes = xmlutil.xpath_find(policy_node, TRANSPORT_BINDING_XPATH)
        
        # If unsuccessful, try again with 2005 XPath
        if not transport_binding_nodes:
            transport_binding_nodes = xmlutil.xpath_find(policy_node, TRANSPORT_BINDING_2005_XPATH)

        # If we did not find any binding, this is potentially bad.
        if not transport_binding_nodes:
            self._log.debug(
                "Potential policy did not match required transport binding: %(policy_id)s",
                {"policy_id": policy_id})
        else:
            self._log.debug("Found matching policy id: %(policy_id)s",
                            {"policy_id": policy_id})

        return policy_id

def _check_soap_action_and_transport(self, binding_node):

        soap_action = ""
        soap_transport = ""
        name = binding_node.get('name')

        soap_transport_attributes = ""
        soap_action_attributes = xmlutil.xpath_find(binding_node, SOAP_ACTION_XPATH)[0].attrib['soapAction']

        if soap_action_attributes:
            soap_action = soap_action_attributes
            soap_transport_attributes = xmlutil.xpath_find(binding_node, SOAP_TRANSPORT_XPATH)[0].attrib['transport']

        if soap_transport_attributes:
            soap_transport = soap_transport_attributes

        if soap_transport == SOAP_HTTP_TRANSPORT_VALUE:
            if soap_action == RST_SOAP_ACTION_13:
                self._log.debug(
                    'found binding matching Action and Transport: %(binding_node)s',
                    {"binding_node": name})
                return WSTrustVersion.WSTRUST13
            elif soap_action == RST_SOAP_ACTION_2005:
                self._log.debug(

def _check_policy(self, policy_node):
        policy_id = policy_node.attrib["{{{}}}Id".format(XmlNamespaces.namespaces['wsu'])]
        
        # Try with Transport Binding XPath
        transport_binding_nodes = xmlutil.xpath_find(policy_node, TRANSPORT_BINDING_XPATH)
        
        # If unsuccessful, try again with 2005 XPath
        if not transport_binding_nodes:
            transport_binding_nodes = xmlutil.xpath_find(policy_node, TRANSPORT_BINDING_2005_XPATH)

        # If we did not find any binding, this is potentially bad.
        if not transport_binding_nodes:
            self._log.debug(
                "Potential policy did not match required transport binding: %(policy_id)s",
                {"policy_id": policy_id})
        else:
            self._log.debug("Found matching policy id: %(policy_id)s",
                            {"policy_id": policy_id})

        return policy_id

def _check_soap_action_and_transport(self, binding_node):

        soap_action = ""
        soap_transport = ""
        name = binding_node.get('name')

        soap_transport_attributes = ""
        soap_action_attributes = xmlutil.xpath_find(binding_node, SOAP_ACTION_XPATH)[0].attrib['soapAction']

        if soap_action_attributes:
            soap_action = soap_action_attributes
            soap_transport_attributes = xmlutil.xpath_find(binding_node, SOAP_TRANSPORT_XPATH)[0].attrib['transport']

        if soap_transport_attributes:
            soap_transport = soap_transport_attributes

        if soap_transport == SOAP_HTTP_TRANSPORT_VALUE:
            if soap_action == RST_SOAP_ACTION_13:
                self._log.debug(
                    'found binding matching Action and Transport: %(binding_node)s',
                    {"binding_node": name})
                return WSTrustVersion.WSTRUST13
            elif soap_action == RST_SOAP_ACTION_2005:
                self._log.debug(
                    'found binding matching Action and Transport: %(binding_node)s',
                    {"binding_node": name})
                return WSTrustVersion.WSTRUST2005