An entity that arranges for an exchange between a buyer and a seller. In most cases a broker never acquires or releases ownership of a product or service involved in an exchange. If it is not clear whether an entity is a broker, seller, or buyer, the latter two terms are preferred.

The time interval used to compute the invoice.

The identifier for the account the payment will be applied to.

Upcoming or past event associated with this place, organization, or action.

How the disease spreads, either as a route or vector, for example 'direct contact', 'Aedes aegypti', etc.

The class of infectious agent (bacteria, prion, etc.) that causes the disease.

The actual infectious agent, such as a specific bacterium.

Imaging technique used.

Thumbnail image for an image or video.

Indicates whether this image is representative of the content of the page.

exif data for this object.

The caption for this object. For downloadable machine formats (closed caption, subtitles etc.) use MediaObject and indicate the [encodingFormat](https://schema.org/encodingFormat).

A medical specialty of the provider.

A medical service available from this provider.

The operating organization, if different from the provider. This enables the representation of services that are provided by an organization, but operated by another organization like a subcontractor.

A polygon is the area enclosed by a point-to-point path for which the starting and ending points are the same. A polygon is expressed as a series of four or more space delimited points where the first and final points are identical.

A line is a point-to-point path consisting of two or more points. A line is expressed as a series of two or more point objects separated by space.

A circle is the circular region of a specified radius centered at a specified latitude and longitude. A circle is expressed as a pair followed by a radius in meters.

A box is the area enclosed by the rectangle formed by two points. The first point is the lower corner, the second point is the upper corner. A box is expressed as two points separated by a space character.

The longitude of a location. For example `-122.08585` ([WGS 84](https://en.wikipedia.org/wiki/World_Geodetic_System)).

The latitude of a location. For example `37.42242` ([WGS 84](https://en.wikipedia.org/wiki/World_Geodetic_System)).

The elevation of a location ([WGS 84](https://en.wikipedia.org/wiki/World_Geodetic_System)). Values may be of the form 'NUMBER UNIT\_OF\_MEASUREMENT' (e.g., '1,000 m', '3,200 ft') while numbers alone should be assumed to be a value in meters.

Status of a game server.

Number of players on the server.