code: def read_rels(archive):
      
      xml_source = archive.read(ARC_WORKBOOK_RELS)
      tree = fromstring(xml_source)
      for element in safe_iterator(tree, '{%s}Relationship' % PKG_REL_NS):
          rId = element.get('Id')
          pth = element.get("Target")
          typ = element.get('Type')
          # normalise path
          if pth.startswith("/xl"):
              pth = pth.replace("/xl", "xl")
          elif not pth.startswith("xl") and not pth.startswith(".."):
              pth = "xl/" + pth
          yield rId, {'path':pth, 'type':typ}
docs: Read relationships for a workbook