New concepts for trader and markets and preliminary definitions

Description of the issue

Here are some new concepts for trader and markets and preliminary definitions.

Ideas of solution

Markup: A markup is added to the total cost incurred by the producer of a good or service (here electricity producers) in order to cover the costs and/or create a profit. Serves to distinguish power plants in our models. Conventional trader: Traders are individuals who engage in buying and selling of goods, commodities etc. for themselves or an institution. Conventional traders are restricted to conventional plants. Demand trader: a fictitious synthesis for all demand in a particular country during a time period. Direct marketer: is the party between power plant owners or portfolio holders and the energy exchange. They facilitate the buying and selling of electricity. Message: Discrete unit of communication. Signal: anything that indicates that a communication should be started Channel: construct to bundle similar messages Product: thing made available for consumer use; it is anything that can be offered to a market Portfolio: a portfolio is a collection of power plants held by a portfolio holder, company, institution or individual. Merit order: The merit order is a way of ranking available sources of energy, especially electrical generation, based on ascending order of price (which may reflect the order of their short-run marginal costs of production) together with amount of energy that will be generated.

Workflow checklist

[x] I discussed the issue with someone else than me before working on a solution
[x] I already read the latest version of the workflow for this repository
[ ] I added this issue to the Project 'Issues'. If suitable, I add it to further Projects.
[x] The goal of this ontology is clear to me

I am aware that

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

OpenEnergyPlatform / ontology