With version 0.2.7 you can use the xrefstyle attribute
like you would do with the DocBook Project stylesheets for HTML output.
Furthermore, you can also use olinks.
Actually, the common DocBook Project stylesheets version 1.72 are now used by dblatex to handle all of these features.
These features are fully described in the DocBook XSL: The Complete Guide book by Bob Stayton. In particular, the following sections cover these topics:
http://www.sagehill.net/docbookxsl/CustomXrefs.html explains how to use xrefstyle.
http://www.sagehill.net/docbookxsl/Olinking.html explains how to use olinks.