[Xy-pic] moving the label away from the arrow (Baptiste Calm?s)

[Baptiste Calmès]

Hi,

chris wrote:
> Hi!
>
> My solution is not very beautiful, but try adding white wpace ("~" or
> "\," or \quad) to the label before/after the actual text...
>
> $$\xymatrix{ A \ar@{}[r]|{\subseteq}^{\quad a} & B}$$
> ......................................^^^^^

Thanks for the answer, but I'm afraid I don't see your point. What  
you suggest shifts the label along the arrow in this example (towards  
the right). What I want is to shift it away (upwards, here).

But I agree that your trick is helpful for vertical arrows.

Baptiste