CDATA encoded into opaque

Hi,
    Looking at the code in libwbxml it appears that CDATAs are encoded 
into opaque for WBXML.

I couldn't find the section in the WBXML specification document that 
specifies this.

Is it specified at all, or is it in any way standardized to do this?

Similar question for not encoding in    <![CDATA[    and     ]]>      
(although of course it makes a lot of sense).

So the complementary question is what is the heuristics for knowing 
what's in an OPAQUE section?

Thanks,
Philippe


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