def update(self, path):
        doc = etree.parse(path)
        xpath = XPath(doc, nsmap={'x':'http://example.org/data'})
        
        self.root = doc.getroot()

        id = xpath.string('//x:id')
        self.id = id % 'oai:example-%s'
        self.modified = xpath.date('//x:modified')
        self.deleted = False

        author_data = []
        for num, el in enumerate(xpath('//x:author'), 1):
            first = xpath.string('//x:author[%d]/x:givenName' % num)
            sur = xpath.string('//x:author[%d]/x:familyName' % num)
            name = u'%s %s' % (first, sur)
            author_data.append({'name': [name],
                                'surname': [sur],
                                'firstname': [first],
                                'role': [u'aut']})

        self.metadata = {'identifier': [u'http://example.org/data/%s' % id],
                         'title': [xpath.string('//x:title')],
                         'subject': xpath.strings('//x:subject'),
                         'description': [xpath.string('//x:abstract')],
                         'creator': [d['name'][0] for d in author_data],
                         'author_data': author_data,
                         'language': [u'en'],
                         'date': [xpath.string('//x:issued')]}
        
        self.sets = {u'example': {u'name':u'example',
                                  u'description':u'An Example Set'}}

        access = xpath.string('//x:access')
        if access == 'public':
            self.sets[u'public'] = {u'name':u'public',
                                    u'description':u'Public access'}
            self.metadata['rights'] = [u'open access']
        elif access == 'private':
            self.sets[u'private'] = {u'name':u'private',
                                     u'description':u'Private access'}
            self.metadata['rights'] = [u'restricted access']
dataset/ETHPy150Open infrae/moai/moai/example.py/ExampleContent.update/swapped operands of `%`