A modification to https://gist.github.com/aurimasv/6693503 to output ISBN ranges for consumption by https://github.com/coolaj86/isbnjs. The range XML data can be generated from https://www.isbn-international.org/range_file_generation.

ISBNTableGenerator.js

/*
  ***** BEGIN LICENSE BLOCK *****
  Generates ISBN registrant tables given XML Range Message
  (from http://www.isbn-international.org/page/ranges) loaded in the browser
  
  Copyright © 2013 Aurimas Vinckevicius (aurimas.dev~at~gmail.com)
  
  This program is free software: you can redistribute it and/or modify
  it under the terms of the GNU Affero General Public License as
  published by the Free Software Foundation, either version 3 of the
  License, or (at your option) any later version.
  
  This program 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 Affero General Public License for more details.
  
  You should have received a copy of the GNU Affero General Public License
  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  
  ***** END LICENSE BLOCK *****
*/

var prefVarName = 'prefs';
var prefs = {};
var same = {};
var groups = document.getElementsByTagName('Group');
for(var i=0, n=groups.length; i<n; i++) {
  var prefix = groups[i].getElementsByTagName('Prefix')[0].textContent.split('-');
  var uccPrefix = prefix[0];
  prefix = prefix[1];
  
  var ranges = [];
  var rules = groups[i].getElementsByTagName('Rule');
  for(var j=0, m=rules.length; j<m; j++) {
      var range = rules[j].getElementsByTagName('Range')[0].textContent.split('-');
      var length = rules[j].getElementsByTagName('Length')[0].textContent * 1;
      ranges.push(range[0].substr(0,length));
      ranges.push(range[1].substr(0,length));
  }
  
  if(ranges.length) {
    ranges = ranges.sort(function(a, b) {
        if(a.length == b.length) return a==b?0:(a<b?-1:1);
        return a.length - b.length;
      });
    var agency = groups[i].getElementsByTagName('Agency')[0].textContent;
    if(!prefs[uccPrefix]) prefs[uccPrefix] = {};
    prefs[uccPrefix][prefix] = {name:agency, ranges:ranges};
  }
}

var parsedGroups = {};
for (var key in prefs['978']) {
  var tempArray = [];
  for (i=0,j=prefs['978'][key].ranges.length; i<j; i += 2) { tempArray.push(prefs['978'][key].ranges.slice(i, i+2)); }
  parsedGroups[key] = {name:prefs['978'][key].name, ranges:tempArray};
}
console.log(JSON.stringify(parsedGroups));