Index: src/org/apache/xerces/impl/dv/xs/AbstractDateTimeDV.java
===================================================================
RCS file: /home/cvspublic/xml-xerces/java/src/org/apache/xerces/impl/dv/xs/AbstractDateTimeDV.java,v
retrieving revision 1.17
diff -u -r1.17 AbstractDateTimeDV.java
--- src/org/apache/xerces/impl/dv/xs/AbstractDateTimeDV.java	28 Sep 2004 21:12:33 -0000	1.17
+++ src/org/apache/xerces/impl/dv/xs/AbstractDateTimeDV.java	30 Sep 2004 18:28:12 -0000
@@ -52,6 +52,25 @@
     public short getAllowedFacets(){
         return ( XSSimpleTypeDecl.FACET_PATTERN | XSSimpleTypeDecl.FACET_WHITESPACE | XSSimpleTypeDecl.FACET_ENUMERATION |XSSimpleTypeDecl.FACET_MAXINCLUSIVE |XSSimpleTypeDecl.FACET_MININCLUSIVE | XSSimpleTypeDecl.FACET_MAXEXCLUSIVE  | XSSimpleTypeDecl.FACET_MINEXCLUSIVE  );
     }//getAllowedFacets()
+    
+    
+    // distinguishes between identity and equality for date/time values
+    // ie: two values representing the same "moment in time" but with different 
+    // remembered timezones are now equal but not identical.
+    public boolean isIdentical (Object value1, Object value2) {
+    	if (!(value1 instanceof DateTimeData) || !(value2 instanceof DateTimeData))
+    		return false;
+    	
+    	DateTimeData v1 = (DateTimeData)value1;
+    	DateTimeData v2 = (DateTimeData)value2;
+
+    	// original timezones must be the same in addition to date/time values
+    	// being 'equal'
+    	if ((v1.timezoneHr == v2.timezoneHr) && (v1.timezoneMin == v2.timezoneMin)) 
+    		return v1.equals(v2);
+    	
+    	return false;
+    }//isIdentical()
 
     // the parameters are in compiled form (from getActualValue)
     public int compare (Object value1, Object value2) {
Index: src/org/apache/xerces/impl/dv/xs/DoubleDV.java
===================================================================
RCS file: /home/cvspublic/xml-xerces/java/src/org/apache/xerces/impl/dv/xs/DoubleDV.java,v
retrieving revision 1.8
diff -u -r1.8 DoubleDV.java
--- src/org/apache/xerces/impl/dv/xs/DoubleDV.java	15 Sep 2004 05:12:23 -0000	1.8
+++ src/org/apache/xerces/impl/dv/xs/DoubleDV.java	30 Sep 2004 18:28:12 -0000
@@ -47,6 +47,15 @@
     public int compare(Object value1, Object value2) {
         return ((XDouble)value1).compareTo((XDouble)value2);
     }//compare()
+    
+    //distinguishes between identity and equality for double datatype
+    //0.0 is equal but not identical to -0.0
+    public boolean isIdentical (Object value1, Object value2) {
+    	if (value2 instanceof XDouble) 
+    		return ((XDouble)value1).isIdentical((XDouble)value2);
+    	
+    	return false;
+    }//isIdentical()
 
     private static final class XDouble implements XSDouble {
         private double value;
@@ -86,6 +95,18 @@
                 return true;
 
             return false;
+        }
+        
+        // NOTE: 0.0 is equal but not identical to -0.0
+        public boolean isIdentical (XDouble val) {
+        	if (val == this)
+        		return true;
+        	
+            Double d1 = new Double(value);
+            Double d2 = new Double(val.value);
+            
+            //Double values of 0.0 and -0.0 return false for Double#equals method
+            return d1.equals(d2); 
         }
 
         private int compareTo(XDouble val) {
Index: src/org/apache/xerces/impl/dv/xs/FloatDV.java
===================================================================
RCS file: /home/cvspublic/xml-xerces/java/src/org/apache/xerces/impl/dv/xs/FloatDV.java,v
retrieving revision 1.8
diff -u -r1.8 FloatDV.java
--- src/org/apache/xerces/impl/dv/xs/FloatDV.java	15 Sep 2004 05:12:23 -0000	1.8
+++ src/org/apache/xerces/impl/dv/xs/FloatDV.java	30 Sep 2004 18:28:12 -0000
@@ -47,6 +47,15 @@
     public int compare(Object value1, Object value2){
         return ((XFloat)value1).compareTo((XFloat)value2);
     }//compare()
+    
+    //distinguishes between identity and equality for float datatype
+    //0.0 is equal but not identical to -0.0
+    public boolean isIdentical (Object value1, Object value2) {  	 	
+    	if (value2 instanceof XFloat) 
+    		return ((XFloat)value1).isIdentical((XFloat)value2);
+    	
+    	return false; 	
+    }//isIdentical()
 
     private static final class XFloat implements XSFloat {
 
@@ -87,6 +96,18 @@
                 return true;
 
             return false;
+        }
+        
+        // NOTE: 0.0 is equal but not identical to -0.0
+        public boolean isIdentical (XFloat val) {
+        	if (val == this)
+        		return true;
+        	
+            Float f1 = new Float(value);
+            Float f2 = new Float(val.value);
+            
+            //Float values of 0.0 and -0.0 return false for Float#equals method
+            return f1.equals(f2); 
         }
 
         private int compareTo(XFloat val) {
Index: src/org/apache/xerces/impl/dv/xs/TypeValidator.java
===================================================================
RCS file: /home/cvspublic/xml-xerces/java/src/org/apache/xerces/impl/dv/xs/TypeValidator.java,v
retrieving revision 1.6
diff -u -r1.6 TypeValidator.java
--- src/org/apache/xerces/impl/dv/xs/TypeValidator.java	24 Feb 2004 22:44:24 -0000	1.6
+++ src/org/apache/xerces/impl/dv/xs/TypeValidator.java	30 Sep 2004 18:28:12 -0000
@@ -58,6 +58,14 @@
     public static final short EQUAL         = 0;
     public static final short GREATER_THAN  = 1;
     public static final short INDETERMINATE = 2;
+    
+    // where there is distinction between identity and equality, this method
+    // will be overwritten
+    // checks whether the two values are identical; for ex, this distinguishes 
+    // -0.0 from 0.0 
+    public boolean isIdentical (Object value1, Object value2) {
+		return value1.equals(value2);
+    }
 
     // check the order relation between the two values
     // the parameters are in compiled form (from getActualValue)
Index: src/org/apache/xerces/impl/dv/xs/XSSimpleTypeDecl.java
===================================================================
RCS file: /home/cvspublic/xml-xerces/java/src/org/apache/xerces/impl/dv/xs/XSSimpleTypeDecl.java,v
retrieving revision 1.55
diff -u -r1.55 XSSimpleTypeDecl.java
--- src/org/apache/xerces/impl/dv/xs/XSSimpleTypeDecl.java	30 Sep 2004 04:19:33 -0000	1.55
+++ src/org/apache/xerces/impl/dv/xs/XSSimpleTypeDecl.java	30 Sep 2004 18:28:13 -0000
@@ -1784,6 +1784,13 @@
             return false;
         return value1.equals(value2);
     }//isEqual()
+    
+    // determine whether the two values are identical
+    public boolean isIdentical (Object value1, Object value2) {
+    	if (value1 == null)
+    		return false;
+    	return fDVs[fValidationDV].isIdentical(value1, value2);
+    }//isIdentical()
 
     // normalize the string according to the whiteSpace facet
     public static String normalize(String content, short ws) {