NTR: medication role and medication material

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One of my projects need to annotate medication. Generally most of terms are 
drug. However, there are something like blood for transfusion clearly not fall 
in that category. We would like to create 'medication role' and 'medication 
material' to hold material that used for medication but not a drug. 

The terms are not available in the OBO Foundry community. 

Here are proposed definitions of the terms.

medication role         
parent: role    
textual definition: A role borne by some material entity which can be 
delivered/administrated into some organisms and the role is realized during 
clinical treatment process aiming to treat symptoms, signs or diagnosed disease.

medication material     
parent: material entity 
textual definition: A material entity that is bearer of a medication role.
logical axiom: equivalent classes
    'material entity' and has_role some 'medication role'

In addition, we would like to assert DRON: 'clinical drug role' as  subclass of 
'medication role'.
DRON: 'clinical drug role'
http://purl.obolibrary.org/obo/DRON_00000001
the role of a material entity to prevent, diagnose, treat, or study disease 
and/or its effects

Original issue reported on code.google.com by zhengj2...@gmail.com on 13 Feb 2015 at 5:39

[BAevermann]

Closed ticket because issue has not been acted upon in reasonable amount of time.