The wikipedia article ontology components describes relations as one of the components of an ontology. It states that relations "specify how objects are related to other objects". Is-a/sub-class and partOf relations are provided as examples.
I am trying to understand the difference between a relation and a property/attribute. For instance, dcterms:creator relates a book and its author. Is it a relation or a property? How do ontology description languages such as OWL differentiate this? Is there a computational/logical difference between a relation and a property?
Can we say that if a term links to another class or entity it is a relation and if it is a literal value, then it is a property/attribute?