pdf mailto links

Hi all,

 

I am using docbook to generate fo which generates 
pdf.

We have 3 kind of links:

1) <ulink url="http://mylink.org"/>

2) <ulink url="http://mylink.org">My link 
text</ulink>

3) <ulink url=mailto:>Feedback</ulink>

 

They are generated in the pdf clickable:

1) http://mylink.org

2) My link text[http://mylink.org]

3) Feedback[mailto:]

 

The first 2 are as I like, but the last one 
isn't:

It should just say Feedback without [mailto:] or the ulink element 
doesn't actually have to be there, as it serves no purpose in the printed 
version.

 

Is there an attribute or command line argument 
which can do this?

 

Thank you for any and all 
help,
Geoffrey