Groovy XML Markup Builder Tricks: CDATA, declaration, comments

gistfile1.groovy

def out = new StringWriter()
def xml = new groovy.xml.MarkupBuilder(out)

// MarkupBuilder gives us an instance of MarkupBuilderHelper named 'mkp'
// MarkupBuilderHelper has several helpful methods
xml.mkp.xmlDeclaration(version: "1.0", encoding: "utf-8")
xml.example {
    a {
        b {
            mkp.comment('a comment')
            c('normal elements')
        }
    }
    d {
        xml.mkp.yieldUnescaped("<![CDATA[Example of text in a CDATA block]]>")
    }
}

assert out.toString() == '''
<?xml version='1.0' encoding='utf-8'?>
<example>
  <a>
    <b><!-- a comment -->
      <c>normal elements</c>
    </b>
  </a>
  <d><![CDATA[Example of text in a CDATA block]]></d>
</example>
'''.trim()

Please, update example if "Example of text" also contains cdata section. Rigth now it is error prone.