true/false in RDF?

I've decided that I want to use URI object values for my Boolean
triples, rather than the literals "true/false".  In other words, instead
of:

 

http://foobar/page.html  urn:myterms:isCached   "true"

 

I want to use:

 

http://foobar/page.html  urn:myterms:isCached
http://xmlns.com/wordnet/1.6/true

 

I can find zero examples of the latter; only the former.  But I think
the latter is right.  Why am I wrong?