XML Schema Validation error/possible bug?

["Beyer,Nathan" <NB...@cerner.com>]

Here's the scenario:

The schema below is valid in both XMLSpy 4.1 and according to the IBM Schema
Quality Checker. When I try to validate the schema against the XML using
Xerces I get the following error: Error: cos-nonambig: (,Avg) and (,Avg)
violate the "Unique Particle Attribution" rule.

The weird thing is that when I change the minOccurs of either the "Min"
element and the "Max" element to 1 (or both), it validates without any
errors.
This is done using Xerces, version 1.4.3.

Can someone help me with this? This is causing a huge problem for me.

Thanks.
-Nathan

The XML -
<?xml version="1.0" encoding="UTF-8"?>
<Bill>
	<Amount>25</Amount>
</Bill>

The XML Schema -
<?xml version="1.0" encoding="UTF-8"?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"
elementFormDefault="qualified">
	<xsd:element name="Bill">
		<xsd:complexType>
			<xsd:choice>
				<xsd:group ref="FirstGroup"/>
				<xsd:group ref="SecondGroup"/>
				<xsd:group ref="ThirdGroup"/>
			</xsd:choice>
		</xsd:complexType>
	</xsd:element>
	<xsd:group name="FirstGroup">
		<xsd:sequence>
			<xsd:element name="Amount" type="xsd:integer"
minOccurs="0" maxOccurs="1"/>
		</xsd:sequence>
	</xsd:group>
	<xsd:group name="SecondGroup">
		<xsd:sequence>
			<xsd:element name="Min" type="xsd:integer"
minOccurs="0" maxOccurs="1"/>
			<xsd:element name="Avg" type="xsd:integer"
minOccurs="0" maxOccurs="1"/>
		</xsd:sequence>
	</xsd:group>
	<xsd:group name="ThirdGroup">
		<xsd:sequence>
			<xsd:element name="Max" type="xsd:integer"
minOccurs="0" maxOccurs="1"/>
			<xsd:element name="Avg" type="xsd:integer"
minOccurs="0" maxOccurs="1"/>
		</xsd:sequence>
	</xsd:group>
</xsd:schema>
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