'return tags dict'

def _to_tags(self, data):

    tags = {}
    xpath = 'DescribeTagsResult/TagDescriptions/member/Tags/member'
    for el in findall(element=data, xpath=xpath, namespace=NS):
        key = findtext(element=el, xpath='Key', namespace=NS)
        value = findtext(element=el, xpath='Value', namespace=NS)
        if key:
            tags[key] = value
    return tags
