rdfs:seeAlso resources

Hi,

I'd like to create a feed containing something like this:

<rss:item rdf:about="#foo">
...
<rdfs:seeAlso rdf:resource="http://sun.com/"/>
...
</rss:item>

I've only seen String, List (of Strings) and Dates as
data types. Is it possible to add a URI and have the
URI serialised as in the example above?

Best regards,
Andreas.