There are no subclasses of Biomass

[areleu]

Description of the issue

From SEDOS meeting. Currently we have no terms for things like wood chips, wood pellets, waste wood, crop wasteamong others.

Ideas of solution

I understand this is a large topic and it would be probably reasonable to dedicate some master thesis to it. But I noticed there was no issue open for it.

Workflow checklist

• [ ] I discussed the issue with someone else than me before working on a solution
• [ ] I already read the latest version of the workflow for this repository
• [ ] The goal of this ontology is clear to me

I am aware that

• [ ] every entry in the ontology should have a definition
• [ ] classes should arise from concepts rather than from words

[l-emele]

Please be aware that we distinguish between biomass and biofuel:

• Biomass is a portion of matter from plants or animals and has thus has a biogenic origin.
• A biofuel is a combustion fuel that has a biogenic origin.