writing entity references.

Using the current draft, is it possible to write out entity references?
I am using the latest xt and trying to use the transformation part of
xsl to write out MathML.

If my template has 
 <mo>&InvisibleApply;</mo>
I get the following error from xt (as I would expect)
          reference to undefined entity "InvisibleApply"

However if I try anything such as  <mo>&amp;InvisibleApply;</mo>
or various incantations with <![CDATA[ then I get no error, but instead
get 

&amp;InvisibleApply;

written to the output, which is not what I want either.

I could make the entity known to xt with its definition as in the MathML
recommendation, which is a character entity pointing at some slot in the
unicode private area, but (unfortunately?) some MathML processors are
really expecting to see the entity name explictly rather than the
equivalent unicode character. In anycase using the names keeps the
generated MathML being more or less humanly readable.

I feel that I am missing something obvious....

David


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