Usage
writeBiopax(biopax, file = "", verbose = TRUE, overwrite = FALSE, namespaces = list(rdf = "http://www.w3.org/1999/02/22-rdf-syntax-ns#", bp = "http://www.biopax.org/release/biopax-level2.owl#", rdfs = "http://www.w3.org/2000/01/rdf-schema#", owl = "http://www.w3.org/2002/07/owl#", xsd = "http://www.w3.org/2001/XMLSchema#"))