With the following pageflow, how can I get the value of username in the result of the id="source" page to be matcher-group 1 value instead of 'orbeon'?
<page id="source" path-info="/user/([^/]+)\/blog/add" matcher="oxf:perl5-matcher" default-submission="parameters.xml">
<setvalue ref="/parameters/dbpath" matcher-group="1"/>
<action>
<result page="destination" transform="oxf:xslt">
<form xsl:version="2.0" xmlns:xsl="
http://www.w3.org/1999/XSL/Transform"> <username>orbeon</username>
</form>
</result>
</action>
</page>
<page id="destination" path-info="/user/([^/]+)\/blog" matcher="oxf:perl5-matcher" view="blogs/${1}/blog.xhtml">
<setvalue ref="/form/username" matcher-group="1"/>
</page>