There will often exist a significant relationship between a pair of articles which are published separately. For example, a published article may subsequently be corrected via an erratum published as an article in its own right. This erratum can declare a relationship with the article it is amending by using a relations:isErratumOf relationship between itself and the article. It is then possible to add the inverse property relations:hasErratum on the original article to point to the erratum which has amended it in some way. The Relations Ontology lists many such pairs of relationships. All of these relationships are subproperties of the Core Ontology property :relation."