This project contains documentation for OBO Format
Note that the spec is currently hosted on http://owlcollab.github.io/oboformat/doc/obo-syntax.html – however, you should be sure to bookmark the permanent URL, which is http://purl.obolibrary.org/obo/oboformat/spec.html
Use this URL:
The code is now integrated into the OWLAPI, version 3.5.x and higher
We recommend the use of ROBOT to convert back and forth
See Conversion example:
robot convert --input foo.owl --output foo.obo
OWLTools Command Line Interface can also be used:
owltools foo.owl -o -f obo foo.obo
The use of owltools will be phased out for this purpose in favor of ROBOT