Is it good/tolerable practice to use elements from W3C standards in a (wannabe five-star) Linked Open Data Ontology?

For example, there is fo:region-body, which is an element of the XSL-FO standard (the prefix fo pointing to namespace ). Imagine I want to use it in an RDF triple in a Linked Open Data Ontology.

It is not a “class” (in the RDF/RDFS/OWL jargon) from some other ontology. But it does belong to a (very official, W3C-defined) namespace.

So my question is: can I use it in my LOD ontology triples?