Settle on type for performers.

[grosscol]

Problem

The performers need to be either persons or information content entities (ICEs). They are currently @typeed as marks in a display (psdo_0000085) which is illogical.

Performer requirements:

• The performers need to be described by information content entities such as positive performance gap.
• The performers need to be able to have professional roles such as nurse.

Solutions

Performer is a person

Define performer as person or group of people. Living system would probably suffice.

Performer is an information content entity

Create predicate that allows relating a professional role to an information content entity in a meaningful and logical way.

Solving this here solves: Display-Lab/slowmo#18

Create DescribedBy predicate for persons OR Create performer information content entity

Creating Performer class

There is a performer element in the ontology, but no corresponding performer content entity as a subclass of ascribee (psdo_0000108).

This is a problem because psdo_0000085 is currently listed as the @type for performers like Alice or Bob in the spek. The element role is about the marks on the page. There needs to be a performer class to serve as the @type for people or groups of people.

Creating DescribedBy predicate

This should be done either way, and can be migrated to it's own subsequent ticket.
Define a DescribedBy predicate such that it has a domain performer, and a range of information content entity. A definition along the lines of, "Indicates an information content entity that describes the subject's performance."

[grosscol]

Going to create a class in the slowmo ontology that is a union of foaf:Person and foaf:Organization. This is because their superclass, foaf:Agent, includes things like software bots and other non-human entities.