Wrong prefixes when export to TTL

[javadch]

When I download an ontology from the system, it creates two prefix entries for oboe-core: @prefix oboe-core: <http://ecoinformatics.org/oboe/oboe.1.2/oboe-core.owl#> . @prefix : <http://ecoinformatics.org/oboe/oboe.1.2/oboe-core.owl#> .

• [ ] It is not clear why OBOE is needed and inserted into the export. It comes with any export even FOAF!
• [ ] The second prefix that comes with a default prefix : overrides the default prefix for the actual base IRI of the ontology. So, if, for example, I create a simple ontology on WebVOWL, export it, add :Experiment rdf:type owl:Class ., and upload it again, the class Experiment will be shown with oboe-core prefix.

[nandikajain]

@javadch I exported all the ontologies to .ttl files. For me I am not getting this error. Can you elaborate on the issue?