anchor.diff:    }
   
     /**
  -   * Adds a [XmlComment] node with the provided `text`.
  -   *
  -   * For example, to generate _<!--Hello World-->_ one would write:
  +   * Adds a [XmlComment] node with the provided [text].
  +   *
  +   * For example, to generate _&lt;!--Hello World-->_ one would write:
      *
      *     builder.comment('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) {
  