cxf - Empty elements for primitve datatypes forbidden in XSD -

i encountered parsing error apache cxf while processing webservice response. comes down empty element being returned:

<myvalue /> 

the element definition follows:

<xsd:element name="myvalue" type="xsd:float" minoccurs="0"> 

now i've read on cxf mailing list empty value not allowed xsd-spec:

well, there isn't workaround it's not bug. empty element not valid decimal or date type or that.
thus, should throw exception.
expecting do?

now here comes question: can find constraint in xml schema specification?

where can find constraint in xml schema specification?

http://www.w3.org/tr/xmlschema-2/#float-lexical-representation

float values have lexical representation consisting of mantissa followed, optionally, character "e" or "e", followed exponent.
...
representations exponent , mantissa must follow lexical rules integer , decimal.
...
special values positive , negative infinity , not-a-number have lexical representations inf, -inf , nan, respectively.

so xs:float requires @ least mantissa xs:decimal...

decimal has lexical representation consisting of finite-length sequence of decimal digits (#x30-#x39) separated period decimal indicator. optional leading sign allowed.

...and empty string not valid xs:decimal.

if don't have value element, should try not including element, if possible. schema seems allow omitting element because minoccurs has value 0. other solution insert suitable replacement value, 0 or nan.