# observationPeriod

The length of time an Observation took place over. The format follows `P[0-9]*[Y|M|D|h|m|s]`. For example, P1Y is Period 1 Year, P3M is Period 3 Months, P3h is Period 3 hours.

## Expected Types

| Type | Description |
|------|-------------|
| [Text](https://schema.org.ai/Text) | Data type: Text. |

## Used on Types

| Type | Description |
|------|-------------|
| [Observation](https://schema.org.ai/Observation) | Instances of the class [Observation](https://schema.org.ai/Observation) are used to specify observations about an entity at a particular time. The principal properties of an [Observation](https://schema.org.ai/Observation) are [observationAbout](https://schema.org.ai/observationAbout), [measuredProperty](https://schema.org.ai/measuredProperty), [statType](https://schema.org.ai/statType), [value](https://schema.org.ai/value) and [observationDate](https://schema.org.ai/observationDate)  and [measuredProperty](https://schema.org.ai/measuredProperty). Some but not all Observations represent a [QuantitativeValue](https://schema.org.ai/QuantitativeValue). Quantitative observations can be about a [StatisticalVariable](https://schema.org.ai/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.ai/value) ) In the context of a quantitative knowledge graph, typical properties could include [measuredProperty](https://schema.org.ai/measuredProperty), [observationAbout](https://schema.org.ai/observationAbout), [observationDate](https://schema.org.ai/observationDate), [value](https://schema.org.ai/value), [unitCode](https://schema.org.ai/unitCode), [unitText](https://schema.org.ai/unitText), [measurementMethod](https://schema.org.ai/measurementMethod). |

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Quoted from Schema.org 30.1, https://schema.org/observationPeriod, under CC BY-SA 3.0. Served by the Org.AI Foundation at https://schema.org.ai/observationPeriod.