When we see a statement like,



<owl:Ontology rdf:about="xml:base"/>


near the start (header) of an ontology, what exactly does this mean?


If we try to read that in plain English, this should mean something like xml:base an Ontology. But my comprehension does not go beyond that. I am missing specially the xml:base part. What role does xml:base play in case of an ontology?


(Reference: A Semantic Web Primer, second edition, Grigoris Antoniou and Frank van Harmelen, p 135.)


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