OntologyProperty : WikiPageWikiLink
Just found the property is included in the dataset that downloaded from http://www.rdfhdt.org/datasets/, which is not found via SPARQL endpoint of DBpedia before.
This property denotes a "Link from a Wikipage to another Wikipage " and DBpedia extracts the Wikipedia page links and offers them for download, but does not add them to the public SPARQL endpoint. There are simply too many of them - they would overwhelm the SPARQL server.
This property might be useful to extract latent relationships between two resources:)