Observation

Instances of the class [Observation](https://schema.org/Observation) are used to specify observations about an entity at a particular time. The principal properties of an [Observation](https://schema.org/Observation) are [observationAbout](https://schema.org/observationAbout), [measuredProperty](https://schema.org/measuredProperty), [statType](https://schema.org/statType), \[\[value\] and [observationDate](https://schema.org/observationDate) and [measuredProperty](https://schema.org/measuredProperty). Some but not all Observations represent a [QuantitativeValue](https://schema.org/QuantitativeValue). Quantitative observations can be about a [StatisticalVariable](https://schema.org/StatisticalVariable), which is an abstract specification about which we can make observations that are grounded at a particular location and time. Observations can also encode a subset of simple RDF-like statements (its observationAbout, a StatisticalVariable, defining the measuredPoperty; its observationAbout property indicating the entity the statement is about, and [value](https://schema.org/value) ) In the context of a quantitative knowledge graph, typical properties could include [measuredProperty](https://schema.org/measuredProperty), [observationAbout](https://schema.org/observationAbout), [observationDate](https://schema.org/observationDate), [value](https://schema.org/value), [unitCode](https://schema.org/unitCode), [unitText](https://schema.org/unitText), [measurementMethod](https://schema.org/measurementMethod).

	Class Property	Expected types	Description
	additionalProperty schema.org	schema.org/PropertyValue
	additionalType schema.org	schema.org/Text schema.org/URL
	alternateName schema.org	schema.org/Text
	description schema.org	schema.org/TextObject schema.org/Text
	disambiguatingDescription schema.org	schema.org/Text
	identifier schema.org	schema.org/URL schema.org/Text schema.org/PropertyValue
	image schema.org	schema.org/URL schema.org/ImageObject
	mainEntityOfPage schema.org	schema.org/URL schema.org/CreativeWork
	maxValue schema.org	schema.org/Number
	minValue schema.org	schema.org/Number
	name schema.org	schema.org/Text
	owner schema.org	schema.org/Person schema.org/Organization
	potentialAction schema.org	schema.org/Action
	sameAs schema.org	schema.org/URL
	subjectOf schema.org	schema.org/Event schema.org/CreativeWork
	unitCode schema.org	schema.org/URL schema.org/Text
	unitText schema.org	schema.org/Text
	url schema.org	schema.org/URL
	value schema.org	schema.org/Text schema.org/StructuredValue schema.org/Number schema.org/Boolean
	valueReference schema.org	schema.org/Text schema.org/MeasurementTypeEnumeration schema.org/DefinedTerm schema.org/StructuredValue schema.org/QuantitativeValue schema.org/QualitativeValue schema.org/PropertyValue schema.org/Enumeration

	Class Property	Expected types	Description
	marginOfError schema.org	schema.org/QuantitativeValue schema.org/DateTime
	measuredProperty schema.org	schema.org/Property
	measuredValue schema.org	schema.org/DataType
	measurementDenominator schema.org	schema.org/StatisticalVariable
	measurementMethod schema.org	schema.org/DefinedTerm schema.org/URL schema.org/Text schema.org/MeasurementMethodEnum
	measurementQualifier schema.org	schema.org/Enumeration
	measurementTechnique schema.org	schema.org/DefinedTerm schema.org/MeasurementMethodEnum schema.org/URL schema.org/Text
	observationAbout schema.org	schema.org/Thing schema.org/Place
	observationDate schema.org	schema.org/Date schema.org/DateTime
	observationPeriod schema.org	schema.org/Text
	observedNode schema.org	schema.org/StatisticalPopulation
	variableMeasured schema.org	schema.org/StatisticalVariable schema.org/Property schema.org/Text schema.org/PropertyValue

SCHEMALL

SCHEMALL

SCHEMALL

Inheritance

Properties

QuantitativeValue