Hi! When converting from OBO to OWL Functional, some prefixed identifiers are expanded without proper escaping, creating the invalid IRIs. Example: * Download [`ecocore.obo`](http://purl.obolibrary.org/obo/ecocore.obo) * Run `owltools ecocore.obo -o -f ofn ecocore.ofn` The resulting file will contain invalid IRIs such as: ``` http://www.geneontology.org/formats/oboInOwl#http://www.w3.org/2000/01/rdf-schema#seeAlso ``` (this is also an obvious roundtrip issue but as far as this goes I'm only concerned about the syntax right now). Related issues: * [owlcs/owlapi#863](https://github.com/owlcs/owlapi/issues/863)