anchor.diff:  
     /// Adds a [XmlProcessing] node with the provided [target] and [text].
     ///
  -  /// For example, to generate a processing element with the _xml-stylesheet_
  -  /// and the attributes _href="/style.css" type="text/css" title="default
  -  /// stylesheet"_ one would write:
  -  ///
  -  ///     builder.processing(
  -  ///         'xml-stylesheet',
  -  ///         'href="/style.css" type="text/css" title="default stylesheet"');
  +  /// For example, to generate an XML processing element `<?xml-stylesheet
  +  /// href="/style.css"?>` one would write:
  +  ///
  +  ///     builder.processing('xml-stylesheet', 'href="/style.css"');
     ///
     void processing(String target, Object text) {
       _stack.last.children.add(XmlProcessing(target, text.toString()));
  
positive.code: 
    /// Adds a [XmlCDATA] node with the provided [text].
    ///
    /// For example, to generate a CDATA element with the text _Hello World_
    /// one would write:
    ///
    ///     builder.cdata('Hello World');
  
negative.code: 
    /// Adds a [XmlDeclaration] node.
    ///
    /// For example, to generate an XML declaration `<?xml version="1.0"
    /// encoding="utf-8"?>` one would write:
    ///
    ///      builder.declaration(encoding: 'UTF-8');
    ///
  