Problem with nillable enumerated type...

[Ebert, Chris]

Hi,
I've declared a simple type that's a enumeration of string values (See
below). I use it later to define an element and say the element is
nillable. When I get a nil element, the deserialization process throws
an IllegalArgumentException: it's trying to find the empty string in the
list of provider codes. This doesn't seem right -- is it? Any
suggestions as to what to do?

Cheers,

Chris

                        <xs:simpleType name="ProviderCode">
                                <xs:restriction base="xs:string">
                                        <xs:enumeration value="CIN">
                                                <xs:annotation>
        
<xs:documentation>Cingular</xs:documentation>
                                                </xs:annotation>
                                        </xs:enumeration>
                                        <xs:enumeration value="VER">
                                                <xs:annotation>
        
<xs:documentation>Verizon</xs:documentation>
                                                </xs:annotation>
                                        </xs:enumeration>
                                        <xs:enumeration value="ATT">
                                                <xs:annotation>
        
<xs:documentation>AT&amp;T</xs:documentation>
                                                </xs:annotation>
                                        </xs:enumeration>
                                        <xs:enumeration value="SPR">
                                                <xs:annotation>
        
<xs:documentation>Sprint</xs:documentation>
                                                </xs:annotation>
                                        </xs:enumeration>
                                        <xs:enumeration value="TMO">
                                                <xs:annotation>
        
<xs:documentation>T-Mobile</xs:documentation>
                                                </xs:annotation>
                                        </xs:enumeration>
                                        <xs:enumeration value="MET">
                                                <xs:annotation>
        
<xs:documentation>MetroPCS</xs:documentation>
                                                </xs:annotation>
                                        </xs:enumeration>
                                        <xs:enumeration value="VIR">
                                                <xs:annotation>
        
<xs:documentation>Virgin</xs:documentation>
                                                </xs:annotation>
                                        </xs:enumeration>
                                        <xs:enumeration value="USC">
                                                <xs:annotation>
        
<xs:documentation>US Cellular</xs:documentation>
                                                </xs:annotation>
                                        </xs:enumeration>
                                        <xs:enumeration value="ALT">
                                                <xs:annotation>
        
<xs:documentation>AllTel</xs:documentation>
                                                </xs:annotation>
                                        </xs:enumeration>
                                        <xs:enumeration value="MID">
                                                <xs:annotation>
        
<xs:documentation>Midwest Wireless</xs:documentation>
                                                </xs:annotation>
                                        </xs:enumeration>
                                        <xs:enumeration value="WES">
                                                <xs:annotation>
        
<xs:documentation>Western Wireless</xs:documentation>
                                                </xs:annotation>
                                        </xs:enumeration>
                                        <xs:enumeration value="NXT">
                                                <xs:annotation>
        
<xs:documentation>Nextel</xs:documentation>
                                                </xs:annotation>
                                        </xs:enumeration>
                                </xs:restriction>
                        </xs:simpleType>