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I could use a return statement with flag like isHTML and noparse, but
I can't seem to find any way to have the "&"  not converted. I try to
return my code in single quote, without success.

Is this a normal behavior, or there is a way to avoid this situation.

I initially try to write a xml style  extention instead, again called
from the template, but I can't send template variable to it , they are
not expanded. This would also fix my problem if I could send
variables, but this doesn't seem to work with template. Is it also an
expected behavior, or the PEBKAC

Thank