Property	Expected Type	Description
Properties from ProgramMembership
hostingOrganization	Organization	The organization (airline, travelers' club, etc.) the membership is made with.
member	Organization  or Person	A member of an Organization or a ProgramMembership. Organizations can be members of organizations; ProgramMembership is typically for individuals. Supersedes members, musicGroupMember. Inverse property: memberOf
membershipNumber	Text	A unique identifier for the membership.
membershipPointsEarned	Number  or QuantitativeValue	The number of membership points earned by the member. If necessary, the unitText can be used to express the units the points are issued in. (E.g. stars, miles, etc.)
programName	Text	The program providing the membership.
Properties from Thing
additionalType	Text  or URL	An additional type for the item, typically used for adding more specific types from external vocabularies in microdata syntax. This is a relationship between something and a class that the thing is in. Typically the value is a URI-identified RDF class, and in this case corresponds to the use of rdf:type in RDF. Text values can be used sparingly, for cases where useful information can be added without their being an appropriate schema to reference. In the case of text values, the class label should follow the schema.org style guide.
alternateName	Text	An alias for the item.
description	Text  or TextObject	A description of the item.
disambiguatingDescription	Text	A sub property of description. A short description of the item used to disambiguate from other, similar items. Information from other properties (in particular, name) may be necessary for the description to be useful for disambiguation.
identifier	PropertyValue  or Text  or URL	The identifier property represents any kind of identifier for any kind of Thing, such as ISBNs, GTIN codes, UUIDs etc. Schema.org provides dedicated properties for representing many of these, either as textual strings or as URL (URI) links. See background notes for more details.
image	ImageObject  or URL	An image of the item. This can be a URL or a fully described ImageObject.
mainEntityOfPage	CreativeWork  or URL	Indicates a page (or other CreativeWork) for which this thing is the main entity being described. See background notes for details. Inverse property: mainEntity
name	Text	The name of the item.
potentialAction	Action	Indicates a potential Action, which describes an idealized action in which this thing would play an 'object' role.
sameAs	URL	URL of a reference Web page that unambiguously indicates the item's identity. E.g. the URL of the item's Wikipedia page, Wikidata entry, or official website.
subjectOf	CreativeWork  or Event	A CreativeWork or Event about this Thing. Inverse property: about
url	URL	URL of the item.

Property	On Types	Description
memberOf	Organization  or Person	An Organization (or ProgramMembership) to which this Person or Organization belongs.
programMembershipUsed	Reservation	Any membership in a frequent flyer, hotel loyalty program, etc. being applied to the reservation.

Terms and conditions