'use strict';
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								var traverse = module.exports = function (schema, opts, cb) {
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								  // Legacy support for v0.3.1 and earlier.
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								  if (typeof opts == 'function') {
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								    cb = opts;
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								    opts = {};
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								  }
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								  cb = opts.cb || cb;
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								  var pre = (typeof cb == 'function') ? cb : cb.pre || function() {};
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								  var post = cb.post || function() {};
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								  _traverse(opts, pre, post, schema, '', schema);
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								};
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								traverse.keywords = {
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								  additionalItems: true,
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								  items: true,
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								  contains: true,
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								  additionalProperties: true,
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								  propertyNames: true,
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								  not: true
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								};
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								traverse.arrayKeywords = {
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								  items: true,
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								  allOf: true,
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								  anyOf: true,
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								  oneOf: true
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								};
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								traverse.propsKeywords = {
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								  definitions: true,
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								  properties: true,
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								  patternProperties: true,
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								  dependencies: true
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								};
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								traverse.skipKeywords = {
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								  default: true,
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								  enum: true,
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								  const: true,
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								  required: true,
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								  maximum: true,
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								  minimum: true,
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								  exclusiveMaximum: true,
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								  exclusiveMinimum: true,
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								  multipleOf: true,
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								  maxLength: true,
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								  minLength: true,
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								  pattern: true,
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								  format: true,
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								  maxItems: true,
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								  minItems: true,
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								  uniqueItems: true,
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								  maxProperties: true,
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								  minProperties: true
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								};
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								function _traverse(opts, pre, post, schema, jsonPtr, rootSchema, parentJsonPtr, parentKeyword, parentSchema, keyIndex) {
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								  if (schema && typeof schema == 'object' && !Array.isArray(schema)) {
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								    pre(schema, jsonPtr, rootSchema, parentJsonPtr, parentKeyword, parentSchema, keyIndex);
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								    for (var key in schema) {
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								      var sch = schema[key];
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								      if (Array.isArray(sch)) {
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								        if (key in traverse.arrayKeywords) {
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								          for (var i=0; i<sch.length; i++)
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								            _traverse(opts, pre, post, sch[i], jsonPtr + '/' + key + '/' + i, rootSchema, jsonPtr, key, schema, i);
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								        }
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								      } else if (key in traverse.propsKeywords) {
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								        if (sch && typeof sch == 'object') {
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								          for (var prop in sch)
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								            _traverse(opts, pre, post, sch[prop], jsonPtr + '/' + key + '/' + escapeJsonPtr(prop), rootSchema, jsonPtr, key, schema, prop);
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								        }
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								      } else if (key in traverse.keywords || (opts.allKeys && !(key in traverse.skipKeywords))) {
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								        _traverse(opts, pre, post, sch, jsonPtr + '/' + key, rootSchema, jsonPtr, key, schema);
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								      }
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								    }
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								    post(schema, jsonPtr, rootSchema, parentJsonPtr, parentKeyword, parentSchema, keyIndex);
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								  }
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								}
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								function escapeJsonPtr(str) {
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								  return str.replace(/~/g, '~0').replace(/\//g, '~1');
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								}
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