anchor.diff:    }
   
     /**
  -   * Adds a [XmlProcessing] node with the provided `target` and `text`.
  -   *
  -   * For example, to generate _<?xml version="1.0"?>_ one would write:
  +   * Adds a [XmlProcessing] node with the provided [target] and [text].
  +   *
  +   * For example, to generate _&lt;?xml version="1.0"?>_ one would write:
      *
      *     builder.processing('xml', 'version="1.0"');
      *
  
positive.code:   }
  
    /**
     * Adds a [XmlAttribute] node with the provided `name` and `value`. If a
     * `namespace` URI is provided, the prefix is looked up, verified and
     * combined with the given attribute `name`.
     *
     * To generate _<message lang="en" />_ one would write:
     *
     *     builder.element('node', nest: () {
     *        builder.attribute('lang', 'en');
  
negative.code:   }
  
    /**
     * 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 _&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')
  