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diff --git a/src/org/z3950/zing/cql/CQLBooleanNode.java b/src/org/z3950/zing/cql/CQLBooleanNode.java
index c56aac4..56c212f 100644
--- a/src/org/z3950/zing/cql/CQLBooleanNode.java
+++ b/src/org/z3950/zing/cql/CQLBooleanNode.java
@@ -1,15 +1,36 @@
-// $Id: CQLBooleanNode.java,v 1.2 2002-10-25 16:11:05 mike Exp $
+// $Id: CQLBooleanNode.java,v 1.6 2002-10-31 22:22:01 mike Exp $
 
 package org.z3950.zing.cql;
 
 
 /**
- * Represents a boolean node in a CQL parse-tree ...
- * ###
+ * Represents a boolean node in a CQL parse-tree.
+ * ##
  *
- * @version	$Id: CQLBooleanNode.java,v 1.2 2002-10-25 16:11:05 mike Exp $
+ * @version	$Id: CQLBooleanNode.java,v 1.6 2002-10-31 22:22:01 mike Exp $
  */
 public abstract class CQLBooleanNode extends CQLNode {
     protected CQLNode left;
     protected CQLNode right;
+
+    abstract String op();
+
+    String toXCQL(int level) {
+	return (indent(level) + "<triple>\n" +
+		booleanXQL(level+1) +
+		left.toXCQL(level+1) +
+		right.toXCQL(level+1) +
+		indent(level) + "</triple>\n");
+    }
+
+    String booleanXQL(int level) {
+	return(indent(level) + "<boolean>\n" +
+	       indent(level+1) + "<value>" + op() + "</value>\n" +
+	       indent(level) + "</boolean>\n");
+    }
+
+    String toCQL() {
+	// ### We don't always need parens around the operands
+	return "(" + left.toCQL() + ") " + op() + " (" + right.toCQL() + ")";
+    }
 }