different gentext for olinks and xref

Is it possible to have different gentext for olinks and xrefs?

e.g. 

<book id="bookId"><title>Book Title</title>

...

<section id="sectionId"><title>Section Title</title>

For <olink targetdoc="bookId" targetptr="sectionId"/> I would like to see something like:

Section x.y "Section Title" in Book Title

For <xref linkend="sectionId"> I would like to see:

Section Title (which will be hyperlinked to the appropriate internal section)

At the moment, if I customise the section template in the xref-number-and-title context, they both change.

Nat