xalan_libxml_issue#283 (#299)

Reviewed-on: #299
Reviewed-by: Wojciech Szewczyk <szewczyw@noreply.example.com>

Backend/tools-services/src/main/java/com/r11/tools/xml/Xalan.java

@@ -61,6 +61,13 @@ public class Xalan implements XmlEngine{
         return nodeType == Node.CDATA_SECTION_NODE || nodeType == Node.TEXT_NODE;
     }
 
+    private boolean isAttributeNode(Node n) {
+        if (n == null)
+            return false;
+        short nodeType = n.getNodeType();
+        return nodeType == Node.CDATA_SECTION_NODE || nodeType == Node.ATTRIBUTE_NODE;
+    }
+
     @Override
     public String processXSLT(XMLMultipleFilesData[] data, String transform) throws Exception {
         throw new UnsupportedOperationException("Xalan does not support multiple files XSLT processing");
@@ -101,7 +108,10 @@ public class Xalan implements XmlEngine{
                     for (Node nn = n.getNextSibling(); isTextNode(nn); nn = nn.getNextSibling()) {
                         resultString.append(nn.getNodeValue());
                     }
-                } else {
+                } else if (isAttributeNode(n)) {
+                    resultString.append(n.getNodeValue());
+                }
+                else {
                     ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
                     serializer.transform(new DOMSource(n), new StreamResult(new OutputStreamWriter(outputStream)));
                     resultString.append(outputStream);