Observation Type

Instances of the class [[Observation]] are used to specify observations about an entity (which may or may not be an instance of a [[StatisticalPopulation]]), at a particular time. The principal properties of an [[Observation]] are [[observedNode]], [[measuredProperty]], [[measuredValue]] (or [[median]], etc.) and [[observationDate]] ([[measuredProperty]] properties can, but need not always, be W3C RDF Data Cube "measure properties", as in the lifeExpectancy example). See also [[StatisticalPopulation]], and the data and datasets overview for more details.

Own Properties
Properties of @schema/ObservationExpected TypeDescription

A marginOfError for an [[Observation]].


The measuredProperty of an [[Observation]], either a schema.org property, a property from other RDF-compatible systems e.g. W3C RDF Data Cube, or schema.org extensions such as GS1's.


The measuredValue of an [[Observation]].


The observationDate of an [[Observation]].


The observedNode of an [[Observation]], often a [[StatisticalPopulation]].

Inherited Properties
Properties inherited from @schema/ThingExpected TypeDescription

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. In RDFa syntax, it is better to use the native RDFa syntax - the 'typeof' attribute - for multiple types. Schema.org tools may have only weaker understanding of extra types, in particular those defined externally.


An alias for the item.


A description of the item.


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.

@schema/identifier or 

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.

@schema/image or 

An image of the item. This can be a [[URL]] or a fully described [[ImageObject]].

@schema/main­Entity­Of­Page or 

Indicates a page (or other CreativeWork) for which this thing is the main entity being described. See background notes for details.


The name of the item.


Indicates a potential Action, which describes an idealized action in which this thing would play an 'object' role.


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.

@schema/subject­Of or 

A CreativeWork or Event about this Thing.


URL of the item.