#3 class attribute given to link tag is lost

[MoMaT]

When a link tag is given a class attribute (to style
the link) like this:
<link class="xxx" ref="site://blabla.zip">blabla.zip</link>
it is transformed to an anchor tag loosing the class
attribute, like this:
<a href="blabla.zip">blabla.zip</a>
All HTML compliant attributes of the link tag should be
preserved.