# Series > [Thing](https://schema.org.ai/Thing) > [Intangible](https://schema.org.ai/Intangible) > [Series](https://schema.org.ai/Series) A Series in schema.org is a group of related items, typically but not necessarily of the same kind. See also [CreativeWorkSeries](https://schema.org.ai/CreativeWorkSeries), [EventSeries](https://schema.org.ai/EventSeries). **Extends:** [Intangible](https://schema.org.ai/Intangible) ## [Thing](https://schema.org.ai/Thing) Properties | Property | Expected Type | Description | |----------|---------------|-------------| | [additionalType](https://schema.org.ai/additionalType) | [Text](https://schema.org.ai/Text), [URL](https://schema.org.ai/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](https://schema.org/docs/styleguide.html). | | [alternateName](https://schema.org.ai/alternateName) | [Text](https://schema.org.ai/Text) | An alias for the item. | | [description](https://schema.org.ai/description) | [Text](https://schema.org.ai/Text), [TextObject](https://schema.org.ai/TextObject) | A description of the item. | | [digital](https://schema.org.ai/digital) | [Number](https://schema.org.ai/Number) | Digital maturity score from 0.0 (fully analog/manual) to 1.0 (fully digital/autonomous). Indicates the degree to which an entity operates digitally. | | [disambiguatingDescription](https://schema.org.ai/disambiguatingDescription) | [Text](https://schema.org.ai/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](https://schema.org.ai/identifier) | [PropertyValue](https://schema.org.ai/PropertyValue), [Text](https://schema.org.ai/Text), [URL](https://schema.org.ai/URL) | The identifier property represents any kind of identifier for any kind of [Thing](https://schema.org.ai/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](https://schema.org/docs/datamodel.html#identifierBg) for more details. | | [image](https://schema.org.ai/image) | [ImageObject](https://schema.org.ai/ImageObject), [URL](https://schema.org.ai/URL) | An image of the item. This can be a [URL](https://schema.org.ai/URL) or a fully described [ImageObject](https://schema.org.ai/ImageObject). | | [mainEntityOfPage](https://schema.org.ai/mainEntityOfPage) | [CreativeWork](https://schema.org.ai/CreativeWork), [URL](https://schema.org.ai/URL) | Indicates a page (or other CreativeWork) for which this thing is the main entity being described. See [background notes](https://schema.org/docs/datamodel.html#mainEntityBackground) for details. | | [name](https://schema.org.ai/name) | [Text](https://schema.org.ai/Text) | The name of the item. | | [owner](https://schema.org.ai/owner) | [Organization](https://schema.org.ai/Organization), [Person](https://schema.org.ai/Person) | A person or organization who owns this Thing. | | [potentialAction](https://schema.org.ai/potentialAction) | [Action](https://schema.org.ai/Action) | Indicates a potential Action, which describes an idealized action in which this thing would play an 'object' role. | | [sameAs](https://schema.org.ai/sameAs) | [URL](https://schema.org.ai/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](https://schema.org.ai/subjectOf) | [CreativeWork](https://schema.org.ai/CreativeWork), [Event](https://schema.org.ai/Event) | A CreativeWork or Event about this Thing. | | [url](https://schema.org.ai/url) | [URL](https://schema.org.ai/URL) | URL of the item. | ## Subtypes | Type | Description | |------|-------------| | [CreativeWorkSeries](https://schema.org.ai/CreativeWorkSeries) | A CreativeWorkSeries in schema.org is a group of related items, typically but not necessarily of the same kind. CreativeWorkSeries are usually organized into some order, often chronological. Unlike [ItemList](https://schema.org.ai/ItemList) which is a general purpose data structure for lists of things, the emphasis with CreativeWorkSeries is on published materials (written e.g. books and periodicals, or media such as TV, radio and games). Specific subtypes are available for describing [TVSeries](https://schema.org.ai/TVSeries), [RadioSeries](https://schema.org.ai/RadioSeries), [MovieSeries](https://schema.org.ai/MovieSeries), [BookSeries](https://schema.org.ai/BookSeries), [Periodical](https://schema.org.ai/Periodical) and [VideoGameSeries](https://schema.org.ai/VideoGameSeries). In each case, the [hasPart](https://schema.org.ai/hasPart) / [isPartOf](https://schema.org.ai/isPartOf) properties can be used to relate the CreativeWorkSeries to its parts. The general CreativeWorkSeries type serves largely just to organize these more specific and practical subtypes. It is common for properties applicable to an item from the series to be usefully applied to the containing group. Schema.org attempts to anticipate some of these cases, but publishers should be free to apply properties of the series parts to the series as a whole wherever they seem appropriate. | | [EventSeries](https://schema.org.ai/EventSeries) | A series of [Events](https://schema.org.ai/Event). Included events can relate with the series using the [superEvent](https://schema.org.ai/superEvent) property. An EventSeries is a collection of events that share some unifying characteristic. For example, "The Olympic Games" is a series, which is repeated regularly. The "2012 London Olympics" can be presented both as an [Event](https://schema.org.ai/Event) in the series "Olympic Games", and as an [EventSeries](https://schema.org.ai/EventSeries) that included a number of sporting competitions as Events. The nature of the association between the events in an [EventSeries](https://schema.org.ai/EventSeries) can vary, but typical examples could include a thematic event series (e.g. topical meetups or classes), or a series of regular events that share a location, attendee group and/or organizers. EventSeries has been defined as a kind of Event to make it easy for publishers to use it in an Event context without worrying about which kinds of series are really event-like enough to call an Event. In general an EventSeries may seem more Event-like when the period of time is compact and when aspects such as location are fixed, but it may also sometimes prove useful to describe a longer-term series as an Event. | --- Quoted from Schema.org 30.1, https://schema.org/Series, under CC BY-SA 3.0. Served by the Org.AI Foundation at https://schema.org.ai/Series.