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copied!<p>I just created gist at: <a href="https://gist.github.com/akhikhl/8070808" rel="noreferrer">https://gist.github.com/akhikhl/8070808</a> to demonstrate how such transformation is done with Groovy and JDOM2.</p> <p>Important notes:</p> <ol> <li>Groovy technically allows using any java libraries. If something cannot be done with Groovy JDK, it can be done with other library.</li> <li>jaxen library (implementing XPath) should be included explicitly (via @Grab or via maven/gradle), since it's an optional dependency of JDOM2.</li> <li>The sequence of @Grab/@GrabExclude instructions fixes the quirky dependence of jaxen on JDOM-1.0.</li> <li>XPathFactory.compile also supports variable binding and filters (see online javadoc).</li> <li>XPathExpression (which is returned by compile) supports two major functions - evaluate and evaluateFirst. evaluate always returns a list of all XML-nodes, satisfying the specified predicate, while evaluateFirst returns just the first matching XML-node.</li> </ol> <p><strong>Update</strong></p> <p>The following code:</p> <pre><code>new XMLOutputter().with { format = Format.getRawFormat() format.setLineSeparator(LineSeparator.NONE) output(doc, System.out) } </code></pre> <p>solves a problem with preserving whitespaces and line separators. getRawFormat constructs a format object that preserves whitespaces. LineSeparator.NONE instructs format object, that it should not convert line separators.</p> <p>The gist mentioned above contains this new code as well.</p>

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