has role has role waste material EcoLexicon:waste ENVO:00002264 A material which is not the desired output of a process and which is typically the input of a process which removes it from its producer (e.g. a disposal process). This seems more like a role than a material. Anything can be waste. Thus, a "waste" role or disposition will be created and this class can then be populated by inference: any environmental material which has [role,disposition] waste will be considered a waste material. SWEETRealm:Waste ENVO https://en.wikipedia.org/wiki/Waste environmental material waste role