Yes, that is well possible and increases a client's ability to understand your data.
So
<div about="#myObject" typeof="http://www.productontology.org/id/Canoe">
<div rel="rdf:type" resource="http://purl.org/goodrelations/v1#SomeItems"></div>
<div property="gr:description" xml:lang="en">... a longer description ...</div>
<div property="gr:name" xml:lang="en">.. a short name for the object ...</div>
<div property="gr:category" content="Outdoors/Boats/Canoes"></div>
</div>
is perfectly valid.
There is currently no official statement from major search engines on the ways they honor additional type information, but it is a safe assumption that
- it does not harm adn
- the more data of this form is out there, the more it will matter for search engines.