How to use the pycsw.core.etree.etree function in pycsw

def _write_codelist_element(codelist_element, codelist_value, nsmap):
    namespace, codelist = codelist_element.split(':')

    element = etree.Element(util.nspath_eval(codelist_element, nsmap),
    codeSpace=CODESPACE, codeList='%s#%s' % (CODELIST, codelist),
    codeListValue=codelist_value)

    element.text = codelist_value

    return element

keywords = util.getqattr(recobj, queryables['dc:subject']['dbcol'])
                if keywords is not None:
                    for keyword in keywords.split(','):
                        etree.SubElement(record,
                        util.nspath_eval('dc:subject',
                        self.parent.context.namespaces)).text = keyword

                val = util.getqattr(recobj, self.parent.context.md_core_model['mappings']['pycsw:TopicCategory'])
                if val:
                    etree.SubElement(record,
                    util.nspath_eval('dc:subject',
                    self.parent.context.namespaces), scheme='http://www.isotc211.org/2005/resources/Codelist/gmxCodelists.xml#MD_TopicCategoryCode').text = val

                val = util.getqattr(recobj, queryables['dc:format']['dbcol'])
                if val:
                    etree.SubElement(record,
                    util.nspath_eval('dc:format',
                    self.parent.context.namespaces)).text = val

                # links
                rlinks = util.getqattr(recobj,
                self.parent.context.md_core_model['mappings']['pycsw:Links'])

                if rlinks:
                    links = rlinks.split('^')
                    for link in links:
                        linkset = link.split(',')
                        etree.SubElement(record,
                        util.nspath_eval('dct:references',
                        self.parent.context.namespaces),
                        scheme=linkset[2]).text = linkset[-1]

# bbox extent
        val = util.getqattr(result, queryables['apiso:BoundingBox']['dbcol'])
        bboxel = write_extent(val, self.namespaces)
        if bboxel is not None and mtype != 'service':
            resident.append(bboxel)

        # service identification

        if mtype == 'service':
            # service type
            # service type version
            val = util.getqattr(result, queryables['apiso:ServiceType']['dbcol'])
            val2 = util.getqattr(result, queryables['apiso:ServiceTypeVersion']['dbcol'])
            if val is not None:
                tmp = etree.SubElement(resident, util.nspath_eval('srv:serviceType', self.namespaces))
                etree.SubElement(tmp, util.nspath_eval('gco:LocalName', self.namespaces)).text = val
                tmp = etree.SubElement(resident, util.nspath_eval('srv:serviceTypeVersion', self.namespaces))
                etree.SubElement(tmp, util.nspath_eval('gco:CharacterString', self.namespaces)).text = val2

            kw = util.getqattr(result, queryables['apiso:Subject']['dbcol'])
            if kw is not None:
                srv_keywords = etree.SubElement(resident, util.nspath_eval('srv:keywords', self.namespaces))
                srv_keywords.append(write_keywords(kw, self.namespaces))

            if bboxel is not None:
                bboxel.tag = util.nspath_eval('srv:extent', self.namespaces)
                resident.append(bboxel)

            val = util.getqattr(result, queryables['apiso:CouplingType']['dbcol'])
            if val is not None:
                couplingtype = etree.SubElement(resident, util.nspath_eval('srv:couplingType', self.namespaces))
                etree.SubElement(couplingtype, util.nspath_eval('srv:SV_CouplingType', self.namespaces), codeListValue=val, codeList='%s#SV_CouplingType' % CODELIST).text = val

elif (par_count > 1):
        LOGGER.debug('ogc:And query (%d predicates)', par_count)
        # Since more than 1 parameter, append the AND logical operator
        logical_and = etree.Element(util.nspath_eval('ogc:And',
                context.namespaces))
        if bbox_element is not None:
            logical_and.append(bbox_element)
        if time_element is not None:
            logical_and.append(time_element)
        if anytext_elements is not None:
            logical_and.extend(anytext_elements)
        root.append(logical_and)

    # Render etree to string XML
    LOGGER.debug(etree.tostring(root, encoding='unicode'))
    return etree.tostring(root, encoding='unicode')