[Ontology-editors] GO_REF

[Chris Mungall]

Why are these in the comments (where they need special code to parse)  
rather than in the definition dbxref?

[Term]
id: GO:0021518
name: spinal cord commissural neuron specification
namespace: biological_process
def: "The process whereby a cell becomes capable of differentiating  
autonomously into a commissural neuron in an environment that is  
neutral with respect to the developmental pathway." [GOC:cls, GOC:dgh,  
GOC:dph, GOC:jic, GOC:mtg_15jun06]
comment: This term was added by GO_REF:0000021.
is_a: GO:0048665 ! neuron fate specification
relationship: part_of GO:0021528 ! commissural neuron differentiation  
in the spinal cord