NULL values in Deciaml Type & XSD

I have an XML export from Notes database that has a corresponding XSD. We are hitting problems with NULL values in decimal datatypes.

A large number of Notes fields contain NULL values but when we try and validate the schema against the XML we get errors stating:

“The ‘totalvalue’ element has an invalid value according to its data type.”

Extract from the XSD below. Any ideas what I need to do to be able to handle NULL values in decimal datatypes? If I change the dattype to string it works fine.

<xs:simpleType name=“totalvalue”>

<xs:restriction base=“xs:decimal”>

</xs:restriction>

</xs:simpleType>

<xs:element ref=“totalvalue” minOccurs=“0”/>

Thanks.

LS