New Post: XSLT function only renders in preview in the console

It does help a lot, Only 1 thing: If I insert the function in the xslt ( <f:function xmlns:f="http://www.composite.net/ns/function/1.0" name="Composite.Web.Request.PageRequestReason" /> ) it prints out the values as it should. I would like to inject it to a xslt variable to test the string like:

<xsl:variable name="pageView">
    <f:function xmlns:f="http://www.composite.net/ns/function/1.0" name="Composite.Web.Request.PageRequestReason" />
</xsl:variable>

This doesn't work. Am I going the wrong way?