[XeTeX] combining characters in isolation

[Mike Maxwell]

Peter Dyballa wrote:
> Why do expect you could put some thing on top of no thing?

So I can display the alphabet.  Some of the Bengali combining characters 
  are vowel symbols, not diacritics.

>> How can I get a combining character to appear in the PDF without 
>> anything (except a space) next to it?
> 
> With Latin combining accents I press SPACE and then this accent as in ¨. 
> Could that work with Bengali as well?

No, at least not with the font I'm using.
-- 
    Mike Maxwell
    What good is a universe without somebody around to look at it?
    --Robert Dicke, Princeton physicist