+ # read metadata from the first file
+ if file_path:
+ if slug:
+ raise ValueError('slug or file_path should be specified, not both')
+ f = open(file_path, 'r')
+ input_xml = etree.parse(f)
+ f.close()
+ else:
+ if not slug:
+ raise ValueError('either slug or file_path should be specified')
+ input_xml = etree.parse(provider[slug])
+
+ metadata = input_xml.find('.//'+RDFNS('Description'))
+ if metadata is None:
+ raise NoDublinCore('Document has no DublinCore - which is required.')
+ book_info = BookInfo.from_element(input_xml)
+