allow empty element for <xsd:decimal> type

Hi There,

I have an XML document with an element which is defined of <xs:decimal> type
in schema.
My program gives me an error where the xml element is empty. It says invalid
value for datatype "decimal".
I tried "nillable=true" attribute while defining element in schema. But it
doesn't work.
Any ideas how to solve this?

Thanks a lot,
-Shital Joshi