Multi inheritance in OEO is it allowed in OEO ontology ?

[AhlemRhayem]

For some cases and for better semantic definition of certain terms we need to have multi-inheritance. Is that allowed in OEO.

For instance, we need to add a sub-class "renewable fuels of non biological origin" of the class "portion of matter". and the sub-class green hydrogen as sub class of the class hydrogen.

The concepts: Methanol, Ammonia, natural gas, Kerosene can be considered as sub classes of both the renewable fuels of non biological origin and the class green hydrogen. Methanol is also defined as sub class of the class hydrocarbon.

If multi-inheritance is not allowed can you tell me what is the adequate solution. is it enough to only mention green hydrogen as sub class of hydrogen and "renewable fuels of non biological origin" a sub-clas of the class "portion of matter".

i attached a figure that present the proposed structure of these classes.

[stap-m]

Hi @AhlemRhayem
Inferred multi-hierarchy is allowed, asserted not. Do you use protege to view the ontology?
Green hydrogen is already there: OEO_00010380
By renewable fuels of non biological origin do you mean something like synthetic fuel? OEO_00010017
If you propose new entities, please always provide an expressive definition proposal. People use terminology differently, that is why we create an ontology.