diff --git a/bin/rdf-ext.js b/bin/rdf-ext.js
deleted file mode 100755
index 663d1a8..0000000
--- a/bin/rdf-ext.js
+++ /dev/null
@@ -1,177 +0,0 @@
-#!/usr/bin/env node
-
-'use strict';
-
-
-global.Promise = require('es6-promise').Promise;
-
-
-var
-  fs = require('fs'),
-  rdf = require('rdf-interfaces'),
-  url = require('url');
-
-require('../rdf-ext')(rdf);
-
-
-var parserClasses = {
-  'jsonld': rdf.JsonLdParser,
-  'ntriples': rdf.TurtleParser,
-  'rdfxml': rdf.RdfXmlParser,
-  'turtle': rdf.TurtleParser
-};
-
-
-var serializerClasses = {
-  'jsonld': rdf.JsonLdSerializer,
-  'ntriples': rdf.NTriplesSerializer,
-  'turtle': rdf.TurtleSerializer
-};
-
-
-var readFsGraph = function (filename, parser) {
-  return function () {
-    var
-      content;
-
-    content = fs.readFileSync(filename).toString();
-
-    return parser.parse(content);
-  };
-};
-
-
-var writeFsGraph = function (filename) {
-  return function (graph) {
-    return outputSerializer.serialize(graph)
-      .then(function (content) {
-        if (typeof content === 'object') {
-          console.log('convert serialized output using JSON.stringify()');
-
-          content = JSON.stringify(content);
-        }
-
-        fs.writeFileSync(filename, content);
-      });
-  }
-};
-
-
-var createParser = function (format, options) {
-  return new rdf.promise.Parser(new parserClasses[format](options));
-};
-
-
-var createSerializer = function (format, options) {
-  return new rdf.promise.Serializer(new serializerClasses[format](options));
-};
-
-
-var usage = function () {
-  process.stderr.write('usage: rdf-ext\n');
-  process.stderr.write('\t--input=FILE_OR_URL\t\n');
-  process.stderr.write('\t--input-format=FORMAT\t[' + Object.keys(parserClasses).join(',') + ']\n');
-  process.stderr.write('\t--output=FILE\n');
-  process.stderr.write('\t--output-format=FORMAT\t[' + Object.keys(serializerClasses).join(',') + ']\n');
-};
-
-
-if (process.argv.length == 2) {
-  usage();
-
-  return;
-}
-
-
-// variables from command line
-var
-  input,
-  inputFormat = 'turtle',
-  output,
-  outputFormat = 'turtle';
-
-
-// parse parameters
-process.argv.slice(2).forEach(function(arg) {
-  var
-    flag = arg.split('=')[0],
-    value = arg.split('=')[1];
-
-  switch(flag) {
-    case '--input':
-      input = value;
-      break;
-
-    case '--input-format':
-      inputFormat = value.toLowerCase();
-      break;
-
-    case '--output':
-      output = value;
-      break;
-
-    case '--output-format':
-      outputFormat = value.toLowerCase();
-      break;
-  }
-});
-
-
-// validate parameters
-if (!(inputFormat in parserClasses)) {
-  process.stderr.write('unknown input format: ' + inputFormat);
-  process.exit();
-}
-
-if (!(outputFormat in serializerClasses)) {
-  process.stderr.write('unknown output format: ' + outputFormat);
-  process.exit();
-}
-
-
-// create process chain
-var
-  inputFilename,
-  inputParser,
-  inputPromise,
-  inputStore,
-  inputUrl,
-  outputPromise,
-  outputSerializer;
-
-
-inputParser = createParser(inputFormat);
-inputStore = new rdf.promise.Store(new rdf.LdpStore());
-outputSerializer = createSerializer(outputFormat);
-inputUrl = url.parse(input);
-
-
-if (inputUrl.protocol == null || inputUrl.protocol === 'file:') {
-  inputFilename = inputUrl.host == null ? inputUrl.path : '/' + inputUrl.host + inputUrl.path;
-
-  console.log('read content from file: ' + inputFilename);
-  console.log('use ' + inputFormat + ' to parse input');
-
-  inputPromise = readFsGraph(inputFilename, inputParser);
-} else {
-  console.log('read graph from url: ' + input);
-
-  inputPromise = function () {
-    return inputStore.graph(input);
-  }
-}
-
-
-console.log('use ' + outputFormat + ' to serialize output');
-console.log('write content to file: ' + output);
-
-outputPromise = writeFsGraph(output);
-
-
-// run process chain
-Promise.resolve()
-  .then(function () { return inputPromise(); })
-  .then(function (graph) { return outputPromise(graph); })
-  .catch(function (error) {
-    console.error(error.stack);
-  });
\ No newline at end of file