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).

An alias for the item.

Awards won by or for this item.

The specific time described by a creative work, for works (e.g. articles, video objects etc.) that emphasise a particular moment within an Event.

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.

A media object that encodes this CreativeWork.

The identifier property represents any kind of identifier for any kind of [Thing](https://schema.org/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.

An image of the item. This can be a [URL](https://schema.org/URL) or a fully described [ImageObject](https://schema.org/ImageObject).

A resource that was used in the creation of this resource. This term can be repeated for multiple sources. For example, http://example.com/great-multiplication-intro.html.

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.

A material that something is made from, e.g. leather, wool, cotton, paper.

The name of the item.

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

The publishing division which published the comic.

Review of the item.

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.

The work that this work has been translated from. E.g. 物种起源 is a translationOf “On the Origin of Species”.

URL of the item.

A work that is a translation of the content of this work. E.g. 西遊記 has an English workTranslation “Journey to the West”, a German workTranslation “Monkeys Pilgerfahrt” and a Vietnamese translation Tây du ký bình khảo.

The subject matter of an object.

Indicates that the resource is compatible with the referenced accessibility API. Values should be drawn from the [approved vocabulary](https://www.w3.org/2021/a11y-discov-vocab/latest/#accessibilityAPI-vocabulary).

Identifies input methods that are sufficient to fully control the described resource. Values should be drawn from the [approved vocabulary](https://www.w3.org/2021/a11y-discov-vocab/latest/#accessibilityControl-vocabulary).

Content features of the resource, such as accessible media, alternatives and supported enhancements for accessibility. Values should be drawn from the [approved vocabulary](https://www.w3.org/2021/a11y-discov-vocab/latest/#accessibilityFeature-vocabulary).

A characteristic of the described resource that is physiologically dangerous to some users. Related to WCAG 2.0 guideline 2.3. Values should be drawn from the [approved vocabulary](https://www.w3.org/2021/a11y-discov-vocab/latest/#accessibilityHazard-vocabulary).

A human-readable summary of specific accessibility features or deficiencies, consistent with the other accessibility metadata but expressing subtleties such as "short descriptions are present but long descriptions will be needed for non-visual users" or "short descriptions are present and no long descriptions are needed".

The human sensory perceptual system or cognitive faculty through which a person may process or perceive the intellectual content of a resource, not including any adaptations of the content (e.g., text alternatives for images). Values should be drawn from the [approved vocabulary](https://www.w3.org/2021/a11y-discov-vocab/latest/#accessMode-vocabulary).

A list of single or combined access modes that are sufficient to understand all the intellectual content of a resource, including any adaptations. Values should be drawn from the [approved vocabulary](https://www.w3.org/2021/a11y-discov-vocab/latest/#accessModeSufficient-vocabulary).

Specifies the Person that is legally accountable for the CreativeWork.

The overall rating, based on a collection of reviews or ratings, of the item.

A secondary title of the CreativeWork.

A media object that encodes this CreativeWork. This property is a synonym for encoding.

An intended audience, i.e. a group for whom something was created.

An embedded audio object.

The author of this content or rating. Please note that author is special in that HTML 5 provides a special mechanism for indicating authorship via the rel tag. That is equivalent to this and may be used interchangeably.

An award won by or for this item.

Fictional person connected with a creative work.

A citation or reference to another creative work, such as another publication, web page, scholarly article, etc.

A medical code for the entity, taken from a controlled vocabulary or ontology such as ICD-9, DiseasesDB, MeSH, SNOMED-CT, RxNorm, etc.

Comments, typically from users.

The number of comments this CreativeWork (e.g. Article, Question or Answer) has received. This is most applicable to works published in Web sites with commenting system; additional comments may exist elsewhere.

The location depicted or described in the content. For example, the location in a photograph or painting.

Official rating of a piece of content—for example, 'MPAA PG-13'.

A secondary contributor to the CreativeWork or Event.

The party holding the legal copyright to the CreativeWork.

The year during which the claimed copyright for the CreativeWork was first asserted.

The creator/author of this CreativeWork. This is the same as the Author property for CreativeWork.

The date on which the CreativeWork was created or the item was added to a DataFeed.

The date on which the CreativeWork was most recently modified or when the item's entry was modified within a DataFeed.

Date of first publication or broadcast. For example the date a [CreativeWork](https://schema.org/CreativeWork) was broadcast or a [Certification](https://schema.org/Certification) was issued.

A link to the page containing the comments of the CreativeWork.

Specifies the Person who edited the CreativeWork.

An alignment to an established educational framework. This property should not be used where the nature of the alignment can be described using a simple property, for example to express that a resource [teaches](https://schema.org/teaches) or [assesses](https://schema.org/assesses) a competency.

The purpose of a work in the context of education; for example, 'assignment', 'group work'.

A media object that encodes this CreativeWork. This property is a synonym for associatedMedia.

A creative work that this work is an example/instance/realization/derivation of.

Media type, typically MIME format (see [IANA site](http://www.iana.org/assignments/media-types/media-types.xhtml)) of the content, e.g. application/zip of a SoftwareApplication binary. In cases where a CreativeWork has several media type representations, 'encoding' can be used to indicate each MediaObject alongside particular fileFormat information. Unregistered or niche file formats can be indicated instead via the most appropriate URL, e.g. defining Web page or a Wikipedia entry.

A person or organization that supports (sponsors) something through some kind of financial contribution.

Genre of the creative work, broadcast channel or group.

A medical guideline related to this entity.

Indicates an item or CreativeWork that is part of this item, or CreativeWork (in some sense).

Headline of the article.

The language of the content or performance or used in an action. Please use one of the language codes from the [IETF BCP 47 standard](http://tools.ietf.org/html/bcp47). See also [availableLanguage](https://schema.org/availableLanguage).

The number of interactions for the CreativeWork using the WebSite or SoftwareApplication. The most specific child type of InteractionCounter should be used.

The predominant mode of learning supported by the learning resource. Acceptable values are 'active', 'expositive', or 'mixed'.

A flag to signal that the item, event, or place is accessible for free.

A resource from which this work is derived or from which it is a modification or adaptation.

Indicates whether this content is family friendly.

Indicates an item or CreativeWork that this item, or CreativeWork (in some sense), is part of.

Keywords or tags used to describe some item. Multiple textual entries in a keywords list are typically delimited by commas, or by repeating the property.

The predominant type or kind characterizing the learning resource. For example, 'presentation', 'handout'.

The drug or supplement's legal status, including any controlled substance schedules that apply.

A license document that applies to this content, typically indicated by URL.

The location where the CreativeWork was created, which may not be the same as the location depicted in the CreativeWork.

Indicates the primary entity described in some page or other CreativeWork.

The system of medicine that includes this MedicalEntity, for example 'evidence-based', 'homeopathic', 'chiropractic', etc.

Indicates that the CreativeWork contains a reference to, but is not necessarily about a concept.

An offer to provide this item—for example, an offer to sell a product, rent the DVD of a movie, perform a service, or give away tickets to an event. Use [businessFunction](https://schema.org/businessFunction) to indicate the kind of transaction offered, i.e. sell, lease, etc. This property can also be used to describe a [Demand](https://schema.org/Demand). While this property is listed as expected on a number of common types, it can be used in others. In that case, using a second type, such as Product or a subtype of Product, can clarify the nature of the offer.

The position of an item in a series or sequence of items.

The person or organization who produced the work (e.g. music album, movie, TV/radio series etc.).

The service provider, service operator, or service performer; the goods producer. Another party (a seller) may offer those services or goods on behalf of the provider. A provider may also serve as the seller.

A publication event associated with the item.

The publisher of the article in question.

The publishingPrinciples property indicates (typically via [URL](https://schema.org/URL)) a document describing the editorial principles of an [Organization](https://schema.org/Organization) (or individual, e.g. a [Person](https://schema.org/Person) writing a blog) that relate to their activities as a publisher, e.g. ethics or diversity policies. When applied to a [CreativeWork](https://schema.org/CreativeWork) (e.g. [NewsArticle](https://schema.org/NewsArticle)) the principles are those of the party primarily responsible for the creation of the [CreativeWork](https://schema.org/CreativeWork). While such policies are most typically expressed in natural language, sometimes related information (e.g. indicating a [funder](https://schema.org/funder)) can be expressed using schema.org terminology.

If applicable, the organization that officially recognizes this entity as part of its endorsed system of medicine.