devilelephant

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')