anchor.diff:    /**
      * Adds a [XmlProcessing] node with the provided [target] and [text].
      *
  -   * For example, to generate _&lt;?xml version="1.0"?>_ one would write:
  +   * For example, to generate a processing element with the _xml_ and the
  +   * attribute _version="1.0"_ one would write:
      *
      *     builder.processing('xml', 'version="1.0"');
      *
  
positive.code:    * 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 _&lt;message>Hello World&lt;/message>_ one would write:
     *
     *     builder.element('message', nest: 'Hello World');
     *
     * 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')
  
negative.code:   /**
     * Adds a [XmlComment] node with the provided [text].
     *
     * For example, to generate a comment with the text _Hello World_ one
     * would write:
     *
     *     builder.comment('Hello World');
     *
  