[EXI] scope of preserve.lexical

Hi EXI experts
        How the white spaces are taken care by EXI ? Is preserve.lexical is
used for it ?
 
        If so, should preserve.lexical also need to take care of white space
information present all over the XML document or is it enough to consider it
only for element and attribute value information ?
 
        While encoding with strict schema the grammar derived from the
schema may not have productions to take care of whitespace information all
over the XML document? How this case can be handled ?
 
regards
Santhanakrishnan