The Order(s) related to this Invoice. One or more Orders may be combined into a single Invoice.

A refundType, from an enumerated list.

The anatomical or organ system drained by this vessel; generally refers to a specific part of an organ.

The regions where the media is allowed. If not specified, then it's assumed to be allowed everywhere. Specify the countries in [ISO 3166 format](http://en.wikipedia.org/wiki/ISO_3166).

Anatomical systems or structures that relate to the superficial anatomy.

A medical condition associated with this anatomy.

Any other drug related to this one, for example commonly-prescribed alternatives.

A link related to this web page, for example to other related web pages.

Related anatomical structure(s) that are not part of the system but relate or connect to it, such as vascular bundles associated with an organ system.

A medical therapy related to this anatomy.

The most generic familial relation.

The release date of a product or product model. This can be used to distinguish the exact variant of a product.

The place and time the release was issued, expressed as a PublicationEvent.

Description of what changed in this version.

The album this is a release of.

The Occupation for the JobPosting.

If applicable, a medical specialty in which this entity is relevant.

The number of attendee places for an event that remain unallocated.

Whether the terms for payment of interest can be renegotiated during the life of the loan.

Defines the number of times a recurring [Event](http://schema.org/Event) will take place

Defines the frequency at which [Events](http://schema.org/Events) will occur according to a schedule [Schedule](http://schema.org/Schedule). The intervals between events should be defined as a [Duration](http://schema.org/Duration) of time.

Number of times one should repeat the activity.

A sub property of object. The object that is being replaced.

A sub property of object. The object that replaces.