# additionalProperty

A property-value pair representing an additional characteristic of the entity, e.g. a product feature or another characteristic for which there is no matching property in schema.org.

Note: Publishers should be aware that applications designed to use specific schema.org properties (e.g. [https://schema.org/width](https://schema.org.ai/width), [https://schema.org/color](https://schema.org.ai/color), [https://schema.org/gtin13](https://schema.org.ai/gtin13), ...) will typically expect such data to be provided using those properties, rather than using the generic property/value mechanism.

## Expected Types

| Type | Description |
|------|-------------|
| [PropertyValue](https://schema.org.ai/PropertyValue) | A property-value pair, e.g. representing a feature of a product or place. Use the 'name' property for the name of the property. If there is an additional human-readable version of the value, put that into the 'description' property. Always use specific schema.org properties when a) they exist and b) you can populate them. Using PropertyValue as a substitute will typically not trigger the same effect as using the original, specific property. |

## Used on Types

| Type | Description |
|------|-------------|
| [MerchantReturnPolicy](https://schema.org.ai/MerchantReturnPolicy) | A MerchantReturnPolicy provides information about product return policies associated with an [Organization](https://schema.org.ai/Organization), [Product](https://schema.org.ai/Product), or [Offer](https://schema.org.ai/Offer). |
| [Offer](https://schema.org.ai/Offer) | An offer to transfer some rights to an item or to provide a service — for example, an offer to sell tickets to an event, to rent the DVD of a movie, to stream a TV show over the internet, to repair a motorcycle, or to loan a book. Note: As the [businessFunction](https://schema.org.ai/businessFunction) property, which identifies the form of offer (e.g. sell, lease, repair, dispose), defaults to [http://purl.org/goodrelations/v1#Sell](http://purl.org/goodrelations/v1#Sell); an Offer without a defined businessFunction value can be assumed to be an offer to sell. For [GTIN](http://www.gs1.org/barcodes/technical/idkeys/gtin)-related fields, see [Check Digit calculator](http://www.gs1.org/barcodes/support/check_digit_calculator) and [validation guide](http://www.gs1us.org/resources/standards/gtin-validation-guide) from [GS1](http://www.gs1.org/). |
| [Place](https://schema.org.ai/Place) | Entities that have a somewhat fixed, physical extension. |
| [Product](https://schema.org.ai/Product) | Any offered product or service. For example: a pair of shoes; a concert ticket; the rental of a car; a haircut; or an episode of a TV show streamed online. |
| [QualitativeValue](https://schema.org.ai/QualitativeValue) | A predefined value for a product characteristic, e.g. the power cord plug type 'US' or the garment sizes 'S', 'M', 'L', and 'XL'. |
| [QuantitativeValue](https://schema.org.ai/QuantitativeValue) | A point value or interval for product characteristics and other purposes. |

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