anchor.diff:  
     /// Adds a [XmlDeclaration] node.
     ///
  -  /// For example, to generate a XML declaration with the default version _1.0_
  -  /// and _UTF-8_ encoding one would write:
  +  /// For example, to generate an XML declaration `<?xml version="1.0"
  +  /// encoding="utf-8"?>` one would write:
     ///
     ///      builder.declaration(encoding: 'UTF-8');
     ///
  
positive.code:   /// a string or another common object that will be converted to a string and
    /// added as a text node.
    ///
    /// For example, to generate an element with the tag _message_ and the
    /// contained text _Hello World_ one would write:
    ///
    ///     builder.element('message', nest: 'Hello World');
  
negative.code: 
    /// Adds a [XmlCDATA] node with the provided [text].
    ///
    /// For example, to generate an XML CDATA element `<![CDATA[Hello World]]>`
    /// one would write:
    ///
    ///     builder.cdata('Hello World');
  