MinOccurs=0 not possible in validation

Question

Hi I have a simple xsd that looks like:
<xs:complexType name="SLATemplate">
<xs:sequence>
<xs:element name="name" type="xs:string" />
<xs:element name="description" type="xs:string" />
<xs:element name="customer" type="xs:string" minOccurs="0"/>
<xs:element name="date" type="xs:string"/>
</xs:sequence>
</xs:complexType>
<rootSla xmlns="slm">
<name>Bookstore SLA</name>
<description>Performance Monitoring</description>
<date>07-06-2007</date>
</rootSla>
When I validate the document loaded in, it complains that <date> is not expected. If I add in the <customer> manually, the validation succeeds. Does anyone know why minOccurs=0 does not work in this case?
I am using orajaxb xdk.
Thanks.

Answer 1

The sequence element does not have a restriction for the minOccurs to not be 0.
minOccurs may be a non-negative integer.
<sequence
id = ID
maxOccurs = (nonNegativeInteger | unbounded) : 1
minOccurs = nonNegativeInteger : 1
{any attributes with non-schema Namespace}...>
Content: (annotation?, (element | group | choice | sequence | any)*)
</sequence>