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diff --git a/src/main/java/org/z3950/zing/cql/CQLSortNode.java b/src/main/java/org/z3950/zing/cql/CQLSortNode.java
index 306f8c6..efc190b 100644
--- a/src/main/java/org/z3950/zing/cql/CQLSortNode.java
+++ b/src/main/java/org/z3950/zing/cql/CQLSortNode.java
@@ -1,4 +1,3 @@
-// $Id: CQLSortNode.java,v 1.2 2008-04-11 12:05:15 mike Exp $
 
 package org.z3950.zing.cql;
 import java.util.ArrayList;
@@ -9,7 +8,6 @@ import java.util.Properties;
 /**
  * Represents a sort node in a CQL parse-tree.
  *
- * @version	$Id: CQLSortNode.java,v 1.2 2008-04-11 12:05:15 mike Exp $
  */
 public class CQLSortNode extends CQLNode {
     /**
@@ -42,31 +40,41 @@ public class CQLSortNode extends CQLNode {
     	return keys;
     }
 
-    public String toXCQL(int level, List<CQLPrefix> prefixes,
+    @Override
+    public void traverse(CQLNodeVisitor visitor) {
+      visitor.onSortNode(this);
+      subtree.traverse(visitor);
+    }
+
+    @Override
+    void toXCQLInternal(XCQLBuilder b, int level, List<CQLPrefix> prefixes,
 			 List<ModifierSet> sortkeys) {
 	if (sortkeys != null)
 	    throw new Error("CQLSortNode.toXCQL() called with sortkeys");
-	return subtree.toXCQL(level, prefixes, keys);
+	subtree.toXCQLInternal(b, level, prefixes, keys);
     }
 
+    @Override
     public String toCQL() {
-	StringBuffer buf = new StringBuffer(subtree.toCQL());
+	StringBuilder buf = new StringBuilder(subtree.toCQL());
 
 	if (keys != null) {
 	    buf.append(" sortby");
 	    for (int i = 0; i < keys.size(); i++) {
 		ModifierSet key = keys.get(i);
-		buf.append(" " + key.toCQL());
+		buf.append(" ").append(key.toCQL());
 	    }
 	}
 
 	return buf.toString();
     }
 
+    @Override
     public String toPQF(Properties config) throws PQFTranslationException {
 	return "@attr 1=oops \"###\"";
     }
 
+    @Override
     public byte[] toType1BER(Properties config)
 	throws PQFTranslationException {
 	// There is no way to represent sorting in a standard Z39.50