tokens: As I understand it , using an ontology to describe the mapping would also require me to express the data schemes themselves in the ontology ( so a relation " maps to " can reference a type from A and a type from B ) .
ner_tags: O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O B-Variable O O O O B-Variable O O