OBO release versions are not legal obo due to lack of declarations

[dosumis]

OBO format files should declare subsets and synonym types.

Merging imports into the OBO release file has led to OBO files that lack some of these declarations.

e.g. xpo.obo

has

[Term]
id: CHEBI:24431
name: chemical entity
namespace: chebi_ontology
def: "A chemical entity is a physical entity of interest in chemistry including molecular entities, parts thereof, and chemical substances." []
subset: 3_STAR
synonym: "chemical entity" EXACT [UniProt]

but the subset is not declared in the header

This prevents consumption by a number of legacy tools. I suspect this is a general ODK release issue, possibly stemming from ROBOT filtering. It may prevent adoption of complete ODK release pipeline by some resources using legacy OBO loaders.

CC @matentzn