[EXI] Handling of xsi:type and xsi:nil attributes in Built-in encoding

Hi WG
    When xsi:type and xsi:nil attributes occur in an xml instance how to
handle them for pure Built-in EXI encoding.
 
Consider the following case
<product xsi:type="xsd:integer">123</product>
 
How the character content 123 will be encoded in the pure built-in EXI
encoding. As a string or as integer ?
 
regards
Santhanakrishnan