Validation error parsing base64 element

Hi,

we've got the following fragment in our xsd:

<xsd:element name="RawData" type="xsd:anyType" minOccurs="0"/>

Now we get an document containing the following part:

<RawData xsi:type="xs:base64Binary" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"> ... Some BASE64 encoded string here ... </RawData>

If i validate the XML Document within eclipse everything is fine.
But if i try to parse/validate the Document with XMLBeans (2.4.0)
i get the following error:

"Invalid xsi:type qname xs:base64Binary"

I googled and done some research but i don't understand why this happens.

Any hint appreciated.
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