diff --git a/src/org/olap4j/driver/xmla/XmlaOlap4jDimension.java b/src/org/olap4j/driver/xmla/XmlaOlap4jDimension.java
index c77a3ec..8473419 100644
--- a/src/org/olap4j/driver/xmla/XmlaOlap4jDimension.java
+++ b/src/org/olap4j/driver/xmla/XmlaOlap4jDimension.java
@@ -63,7 +63,7 @@ public Hierarchy getDefaultHierarchy() {
         return hierarchies.get(0);
     }
 
-    public boolean equeals(Object obj) {
+    public boolean equals(Object obj) {
         return (obj instanceof XmlaOlap4jDimension) &&
             this.uniqueName.equals(
                 ((XmlaOlap4jDimension)obj).getUniqueName());
diff --git a/src/org/olap4j/driver/xmla/XmlaOlap4jElement.java b/src/org/olap4j/driver/xmla/XmlaOlap4jElement.java
index 2a85ea4..844bc4a 100644
--- a/src/org/olap4j/driver/xmla/XmlaOlap4jElement.java
+++ b/src/org/olap4j/driver/xmla/XmlaOlap4jElement.java
@@ -70,7 +70,7 @@ public int hashCode() {
 
     // Keep this declaration abstract as a reminder to
     // overriding classes.
-    abstract public boolean equeals(Object obj);
+    abstract public boolean equals(Object obj);
 }
 
 // End XmlaOlap4jElement.java
diff --git a/src/org/olap4j/driver/xmla/XmlaOlap4jHierarchy.java b/src/org/olap4j/driver/xmla/XmlaOlap4jHierarchy.java
index 898fa3a..b49004a 100644
--- a/src/org/olap4j/driver/xmla/XmlaOlap4jHierarchy.java
+++ b/src/org/olap4j/driver/xmla/XmlaOlap4jHierarchy.java
@@ -79,7 +79,7 @@ public NamedList<Member> getRootMembers() throws OlapException {
         return Olap4jUtil.cast(list);
     }
 
-    public boolean equeals(Object obj) {
+    public boolean equals(Object obj) {
         return (obj instanceof XmlaOlap4jHierarchy) &&
             this.uniqueName.equals(
                 ((XmlaOlap4jHierarchy)obj).getUniqueName());
diff --git a/src/org/olap4j/driver/xmla/XmlaOlap4jLevel.java b/src/org/olap4j/driver/xmla/XmlaOlap4jLevel.java
index 7970f84..bb16d59 100644
--- a/src/org/olap4j/driver/xmla/XmlaOlap4jLevel.java
+++ b/src/org/olap4j/driver/xmla/XmlaOlap4jLevel.java
@@ -137,7 +137,7 @@ public int getCardinality() {
         return cardinality;
     }
 
-    public boolean equeals(Object obj) {
+    public boolean equals(Object obj) {
         return (obj instanceof XmlaOlap4jLevel) &&
             this.uniqueName.equals(
                 ((XmlaOlap4jLevel)obj).getUniqueName());
diff --git a/src/org/olap4j/driver/xmla/XmlaOlap4jProperty.java b/src/org/olap4j/driver/xmla/XmlaOlap4jProperty.java
index 340a539..67a9c9c 100644
--- a/src/org/olap4j/driver/xmla/XmlaOlap4jProperty.java
+++ b/src/org/olap4j/driver/xmla/XmlaOlap4jProperty.java
@@ -63,7 +63,7 @@ public ContentType getContentType() {
         return contentType;
     }
 
-    public boolean equeals(Object obj) {
+    public boolean equals(Object obj) {
         return (obj instanceof XmlaOlap4jProperty) &&
             this.uniqueName.equals(
                 ((XmlaOlap4jProperty)obj).getUniqueName());
diff --git a/testsrc/org/olap4j/OlapTreeTest.java b/testsrc/org/olap4j/OlapTreeTest.java
new file mode 100644
index 0000000..a302031
--- /dev/null
+++ b/testsrc/org/olap4j/OlapTreeTest.java
@@ -0,0 +1,77 @@
+/*
+// $Id:$
+// This software is subject to the terms of the Eclipse Public License v1.0
+// Agreement, available at the following URL:
+// http://www.eclipse.org/legal/epl-v10.html.
+// Copyright (C) 2007-2009 Julian Hyde
+// All Rights Reserved.
+// You must accept the terms of that agreement to use this software.
+*/
+package org.olap4j;
+
+import java.sql.Connection;
+import java.util.HashMap;
+import java.util.Map;
+
+import org.olap4j.metadata.Cube;
+import org.olap4j.metadata.Dimension;
+import org.olap4j.metadata.Hierarchy;
+import org.olap4j.metadata.Schema;
+import org.olap4j.test.TestContext;
+
+import junit.framework.TestCase;
+
+/**
+ * Tests some particularities of the OLAP tree objects.
+ * @author Luc Boudreau
+ */
+public class OlapTreeTest extends TestCase {
+
+    private final TestContext.Tester tester =
+        TestContext.instance().getTester();
+
+    /**
+     * Simple strategy to prevent connection leaks: each test that needs a
+     * connection assigns it to this field, and {@link #tearDown()} closes it
+     * if it is not already closed.
+     */
+    private Connection connection;
+
+    protected void tearDown() throws Exception {
+        // Simple strategy to prevent connection leaks
+        if (connection != null
+            && !connection.isClosed())
+        {
+            connection.close();
+            connection = null;
+        }
+    }
+
+    /**
+     * Tests if olap objects can be included in collections and
+     * retrieved properly.
+     */
+    public void testHashCompatibility() throws Exception {
+        connection = tester.createConnection();
+        OlapConnection olapConnection =
+            tester.getWrapper().unwrap(connection, OlapConnection.class);
+        Schema schema = olapConnection.getSchema();
+        Cube cube = schema.getCubes().get("Sales");
+
+        Map<Dimension,String> dimensionMap =
+            new HashMap<Dimension,String>();
+        Dimension dim1 = cube.getDimensions().get("Promotion Media");
+        dimensionMap.put(dim1, "Test1");
+        assertTrue(dimensionMap.containsKey(dim1));
+        assertEquals("Test1", dimensionMap.get(dim1));
+
+        Map<Hierarchy,String> hierarchyMap =
+            new HashMap<Hierarchy, String>();
+        Hierarchy hchy1 = dim1.getDefaultHierarchy();
+        hierarchyMap.put(hchy1, "Test2");
+        assertTrue(hierarchyMap.containsKey(hchy1));
+        assertEquals("Test2", hierarchyMap.get(hchy1));
+        assertTrue(dimensionMap.containsKey(hchy1.getDimension()));
+    }
+}
+// End OlapTreeTest.java
\ No newline at end of file