UBL schema validation

Hi,

I扉e tried to compose an Invoice document but in order to make schema 
validation works I have to specified all the namespaces prefixs for each 
element and all the namespaces definition and schema locations. As you 
can see in the attached document it愀 a kind of crazy ...

Is it the only way to make it work? Please, could someone send me an 
UBL1.0 Invoice sample?

Thanks in advance,
Jorge

P.S: I惴 using Xerces 2-6-2 for schema validation.