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#!/usr/bin/env python3
# update/isbn.py - script to get ISBN prefix data
#
# Copyright (C) 2010-2026 Arthur de Jong
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
# 02110-1301 USA
"""This script downloads XML data from the International ISBN Agency
website and provides a compact form of all group prefixes, and registrant
ranges for those prefixes suitable for the numdb module. This data is needed
to correctly split ISBNs into an EAN.UCC prefix, a group prefix, a registrant,
an item number and a check-digit."""
import lxml.etree
import requests
# the location of the ISBN Ranges XML file
download_url = 'https://www.isbn-international.org/export_rangemessage.xml'
# The user agent that will be passed in requests
user_agent = 'Mozilla/5.0 (compatible; python-stdnum updater; +https://arthurdejong.org/python-stdnum/)'
def ranges(group):
"""Provide the ranges for the group."""
for rule in group.findall('./Rules/Rule'):
length = int(rule.find('./Length').text.strip())
if length:
yield '-'.join(
x[:length]
for x in rule.find('./Range').text.strip().split('-'))
def wrap(text):
"""Rewrap the provided text into lines."""
while text:
i = len(text)
if i > 73:
i = text.rindex(',', 20, 73)
yield text[:i]
text = text[i + 1:]
if __name__ == '__main__':
print('# generated from RangeMessage.xml, downloaded from')
print('# %s' % download_url)
response = requests.get(download_url, timeout=30, headers={'User-Agent': user_agent})
response.raise_for_status()
# parse XML document
document = lxml.etree.fromstring(response.content)
# dump data from document
print('# file serial %s' % document.find('./MessageSerialNumber').text.strip())
print('# file date %s' % document.find('./MessageDate').text.strip())
top_groups = dict(
(x.find('./Prefix').text.strip(), x)
for x in document.findall('./EAN.UCCPrefixes/EAN.UCC'))
prevtop = None
for group in document.findall('./RegistrationGroups/Group'):
top, prefix = group.find('./Prefix').text.strip().split('-')
agency = group.find('./Agency').text.strip()
if top != prevtop:
print(top)
for line in wrap(','.join(ranges(top_groups[top]))):
print(' %s' % line)
prevtop = top
print(' %s agency="%s"' % (prefix, agency))
for line in wrap(','.join(ranges(group))):
print(' %s' % line)
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