orthogonal_to relation

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Hi,

There is a previous discussion on the orthogonal_to relation at [2]. 

In BSPO the property orthogonal_to
 - has domain 'anatomical axis' and range 'anatomical plane'.
 - is not symmetric

My considerations:
 a) In my opinion orthogonal_to has to be a symmetric property. This would require that the domain and range are the same: either both undefined or bot the same class. 
 b) In [2] Melissa said, that they need the existing domain and range definitions. So one solution would be to rename the property to has_orthogonal_complement_in_3D and make it a subproperty of orthogonal_to. But even this property should be symmetric in the ideal case.

What do you think?

Best regards,
Heiner

[2] 
http://sourceforge.net/p/obo/common-anatomy-reference-ontology-caro-requests/11/

Original issue reported on code.google.com by Heiner.O...@gmail.com on 27 Sep 2014 at 1:43