link Element in entrytbl FO Transformation not Clickable

docbook-rng-5.0b7 xsl-1.71.0 xep-4.6 (current) oxygenxml-7.2.0
(eclipse-3.2.0 plugin)

 

The <link ns1:href> element appears as a link but is
not active (clickable) within an <entrytbl> <entry> element subsequent
to an fo (pdf) transformation.

 

No problem with HTML transformations.

 

Is this by design, a defect or my incorrect usage?

 

Ray