[bugfix] XdmValue of(item) could not handle NodeProxy items

Author: Nico Verwer

exist-core/src/main/java/org/exist/xquery/functions/fn/transform/Convert.java

@@ -26,6 +26,7 @@
 import net.sf.saxon.type.BuiltInAtomicType;
 import org.exist.dom.QName;
 import org.exist.dom.memtree.DocumentImpl;
+import org.exist.dom.persistent.NodeProxy;
 import org.exist.xquery.ErrorCodes;
 import org.exist.xquery.XPathException;
 import org.exist.xquery.functions.array.ArrayType;
@@ -119,6 +120,9 @@ static net.sf.saxon.s9api.QName of(final QNameValue qName) {
         }
 
         XdmValue of(final Item item) throws XPathException {
+            if (item instanceof NodeProxy) {
+              return ofNode(((NodeProxy) item).getNode());
+            }
             final int itemType = item.getType();
             if (Type.subTypeOf(itemType, Type.ATOMIC)) {
                 return ofAtomic((AtomicValue) item);