anchor.diff:    }
   
     /**
  -   * Adds a [XmlElement] node with the provided tag `name`.
  -   *
  -   * If a `namespace` URI is provided, the prefix is looked up, verified and
  -   * combined with the given tag `name`.
  -   *
  -   * If a map of `namespaces` is provided the uri-prefix pairs are added to the
  -   * element declaration, see also [XmlBuilder#namespace].
  -   *
  -   * If a map of `attributes` is provided the name-value pairs are added to the
  -   * element declaration, see also [XmlBuilder#attribute].
  -   *
  -   * Finally, `nest` is used to further customize the element and to add its
  +   * Adds a [XmlElement] node with the provided tag [name].
  +   *
  +   * If a [namespace] URI is provided, the prefix is looked up, verified and
  +   * combined with the given tag [name].
  +   *
  +   * If a map of [namespaces] is provided the uri-prefix pairs are added to the
  +   * element declaration, see also [XmlBuilder.namespace].
  +   *
  +   * If a map of [attributes] is provided the name-value pairs are added to the
  +   * element declaration, see also [XmlBuilder.attribute].
  +   *
  +   * Finally, [nest] is used to further customize the element and to add its
      * children. Typically this is a [Function] that defines elements using the
      * same builder object. For convenience `nest` can also be a string or another
      * common object that will be converted to a string and added as a text node.
      *
  -   * For example, to generate _<message>Hello World</message>_ one would write:
  +   * For example, to generate _&lt;message>Hello World&lt;/message>_ one would write:
      *
      *     builder.element('message', nest: 'Hello World');
      *
  -   * To add multiple child elements as in _<message>Hello
  -   * World<break /></message>_ one would write:
  +   * To add multiple child elements as in _&lt;message>Hello
  +   * World&lt;break />&lt;/message>_ one would write:
      *
      *     builder.element('message', nest: () {
      *       builder..text('Hello World')
  
positive.code:   final List<_XmlNodeBuilder> _stack = new List.from([new _XmlDocumentBuilder()]);
  
    /**
     * Adds a [XmlText] node with the provided `text`.
     *
     * For example, to generate _Hello World_ one would write:
     *
  
negative.code:   }
  
    /**
     * Binds a namespace [prefix] to the provided [uri]. The [prefix] can be
     * omitted to declare a default namespace. Throws an [ArgumentError] if
     * the [prefix] is invalid or conflicts with an existing delcaration.
     */
    void namespace(String uri, [String prefix]) {
      if (prefix == _XMLNS || prefix == _XML) {
  