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To see more examples of using GroovyMarkup try looking at our unit test cases
{link:XML unit tests|http://svn.codehaus.org/groovy/trunk/groovy/groovy-core/src/test/groovy/xml}{link}Wiki Markup {link:Wiki Markup - Ant unit tests|http://svn.codehaus.org/groovy/trunk/groovy/groovy-core/src/main/groovy/util/AntBuilder.java}{link}
{link:Wiki Markup - Swing demos|http://svn.codehaus.org/groovy/trunk/groovy/groovy-core/src/test/groovy/swing}{link}
There is more detail on markup here Make a builder.