core + meta (Meta Extension): terms used within for schema definitions.


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Thing > Intangible > PropertyValueSpecification

A Property value specification.
PropertyExpected TypeDescription
Properties from PropertyValueSpecification
defaultValue Text  or
The default value of the input. For properties that expect a literal, the default is a literal value, for properties that expect an object, it's an ID reference to one of the current values.
maxValue Number The upper value of some characteristic or property.
minValue Number The lower value of some characteristic or property.
multipleValues Boolean Whether multiple values are allowed for the property. Default is false.
readonlyValue Boolean Whether or not a property is mutable. Default is false. Specifying this for a property that also has a value makes it act similar to a "hidden" input in an HTML form.
stepValue Number The stepValue attribute indicates the granularity that is expected (and required) of the value in a PropertyValueSpecification.
valueMaxLength Number Specifies the allowed range for number of characters in a literal value.
valueMinLength Number Specifies the minimum allowed range for number of characters in a literal value.
valueName Text Indicates the name of the PropertyValueSpecification to be used in URL templates and form encoding in a manner analogous to HTML's input@name.
valuePattern Text Specifies a regular expression for testing literal values according to the HTML spec.
valueRequired Boolean Whether the property must be filled in to complete the action. Default is false.
Properties from Thing
additionalType 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. In RDFa syntax, it is better to use the native RDFa syntax - the 'typeof' attribute - for multiple types. tools may have only weaker understanding of extra types, in particular those defined externally.
alternateName Text An alias for the item.
description Text A description of the item.
disambiguatingDescription 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 PropertyValue  or
Text  or
The identifier property represents any kind of identifier for any kind of Thing, such as ISBNs, GTIN codes, UUIDs etc. provides dedicated properties for representing many of these, either as textual strings or as URL (URI) links. See background notes for more details.
image ImageObject  or
An image of the item. This can be a URL or a fully described ImageObject.
mainEntityOfPage CreativeWork  or
Indicates a page (or other CreativeWork) for which this thing is the main entity being described. See background notes for details.
Inverse property: mainEntity.
name Text The name of the item.
potentialAction Action Indicates a potential Action, which describes an idealized action in which this thing would play an 'object' role.
sameAs 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 CreativeWork  or
A CreativeWork or Event about this Thing..
Inverse property: about.
url URL URL of the item.

Available properties in extensions


The Actions mechanism benefited from extensive discussions across the Web standards community around W3C, in particular from the Hydra project's community group.

Schema Version 3.3