diff --git a/openide.util/src/org/openide/xml/XMLUtil.java b/openide.util/src/org/openide/xml/XMLUtil.java
--- a/openide.util/src/org/openide/xml/XMLUtil.java
+++ b/openide.util/src/org/openide/xml/XMLUtil.java
@@ -44,34 +44,23 @@
 import java.io.CharConversionException;
 import java.io.IOException;
 import java.io.OutputStream;
-import java.io.StringReader;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.HashMap;
-import java.util.HashSet;
 import java.util.List;
 import java.util.logging.Level;
 import java.util.logging.Logger;
 import java.util.Map;
-import java.util.Set;
 import javax.xml.parsers.DocumentBuilder;
 import javax.xml.parsers.DocumentBuilderFactory;
 import javax.xml.parsers.FactoryConfigurationError;
 import javax.xml.parsers.ParserConfigurationException;
 import javax.xml.parsers.SAXParserFactory;
-import javax.xml.transform.OutputKeys;
-import javax.xml.transform.Result;
-import javax.xml.transform.Source;
-import javax.xml.transform.Transformer;
-import javax.xml.transform.TransformerFactory;
 import javax.xml.transform.dom.DOMSource;
-import javax.xml.transform.stream.StreamResult;
-import javax.xml.transform.stream.StreamSource;
 import javax.xml.validation.Schema;
 import javax.xml.validation.Validator;
 import org.openide.util.Exceptions;
 import org.w3c.dom.Attr;
-import org.w3c.dom.CDATASection;
 import org.w3c.dom.DOMException;
 import org.w3c.dom.DOMImplementation;
 import org.w3c.dom.Document;
@@ -81,6 +70,9 @@
 import org.w3c.dom.Node;
 import org.w3c.dom.NodeList;
 import org.w3c.dom.Text;
+import org.w3c.dom.ls.DOMImplementationLS;
+import org.w3c.dom.ls.LSOutput;
+import org.w3c.dom.ls.LSSerializer;
 import org.xml.sax.EntityResolver;
 import org.xml.sax.ErrorHandler;
 import org.xml.sax.InputSource;
@@ -355,27 +347,6 @@
     }
 
     /**
-     * Identity transformation in XSLT with indentation added.
-     * Just using the identity transform and calling
-     * t.setOutputProperty(OutputKeys.INDENT, "yes");
-     * t.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "4");
-     * does not work currently.
-     * You really have to use this bogus stylesheet.
-     * @see "JDK bug #5064280"
-     */
-    private static final String IDENTITY_XSLT_WITH_INDENT =
-            "<xsl:stylesheet version='1.0' " + // NOI18N
-            "xmlns:xsl='http://www.w3.org/1999/XSL/Transform' " + // NOI18N
-            "xmlns:xalan='http://xml.apache.org/xslt' " + // NOI18N
-            "exclude-result-prefixes='xalan'>" + // NOI18N
-            "<xsl:output method='xml' indent='yes' xalan:indent-amount='4'/>" + // NOI18N
-            "<xsl:template match='@*|node()'>" + // NOI18N
-            "<xsl:copy>" + // NOI18N
-            "<xsl:apply-templates select='@*|node()'/>" + // NOI18N
-            "</xsl:copy>" + // NOI18N
-            "</xsl:template>" + // NOI18N
-            "</xsl:stylesheet>"; // NOI18N
-    /**
      * Writes a DOM document to a stream.
      * The precise output format is not guaranteed but this method will attempt to indent it sensibly.
      * 
@@ -398,58 +369,17 @@
             throw new NullPointerException("You must set an encoding; use \"UTF-8\" unless you have a good reason not to!"); // NOI18N
         }
         Document doc2 = normalize(doc);
-        try {
-            Transformer t = TransformerFactory.newInstance().newTransformer(
-                    new StreamSource(new StringReader(IDENTITY_XSLT_WITH_INDENT)));
-            DocumentType dt = doc2.getDoctype();
-            if (dt != null) {
-                String pub = dt.getPublicId();
-                if (pub != null) {
-                    t.setOutputProperty(OutputKeys.DOCTYPE_PUBLIC, pub);
-                }
-                String sys = dt.getSystemId();
-                if (sys != null) {
-                    t.setOutputProperty(OutputKeys.DOCTYPE_SYSTEM, sys);
-                }
-            }
-            t.setOutputProperty(OutputKeys.ENCODING, enc);
-
-            // See #123816
-            Set<String> cdataQNames = new HashSet<String>();
-            collectCDATASections(doc2, cdataQNames);
-            if (cdataQNames.size() > 0) {
-                StringBuilder cdataSections = new StringBuilder();
-                for(String s : cdataQNames) {
-                    cdataSections.append(s).append(' '); //NOI18N
-                }
-                t.setOutputProperty(OutputKeys.CDATA_SECTION_ELEMENTS, cdataSections.toString());
-            }
-            
-            Source source = new DOMSource(doc2);
-            Result result = new StreamResult(out);
-            t.transform(source, result);
-        } catch (Exception e) {
-            throw new IOException(e);
+        DOMImplementationLS ls = (DOMImplementationLS) doc2.getImplementation().getFeature("LS", "3.0"); // NOI18N
+        assert ls != null : "No DOM 3 LS supported in " + doc2.getClass().getName();
+        LSOutput output = ls.createLSOutput();
+        output.setEncoding(enc);
+        output.setByteStream(out);
+        LSSerializer ser = ls.createLSSerializer();
+        String fpp = "format-pretty-print"; // NOI18N
+        if (ser.getDomConfig().canSetParameter(fpp, true)) {
+            ser.getDomConfig().setParameter(fpp, true);
         }
-    }
-
-    private static void collectCDATASections(Node node, Set<String> cdataQNames) {
-        if (node instanceof CDATASection) {
-            Node parent = node.getParentNode();
-            if (parent != null) {
-                String uri = parent.getNamespaceURI();
-                if (uri != null) {
-                    cdataQNames.add("{" + uri + "}" + parent.getNodeName()); //NOI18N
-                } else {
-                    cdataQNames.add(parent.getNodeName());
-                }
-            }
-        }
-        
-        NodeList children = node.getChildNodes();
-        for(int i = 0; i < children.getLength(); i++) {
-            collectCDATASections(children.item(i), cdataQNames);
-        }
+        ser.write(doc2, output);
     }
 
     /**