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A Type
A SpeakableSpecification indicates (typically via xpath or cssSelector) sections of a document that are highlighted as particularly speakable. Instances of this type are expected to be used primarily as values of the speakable property.
PropertyExpected TypeDescription
Properties from SpeakableSpecification
cssSelector CssSelectorType A CSS selector, e.g. of a SpeakableSpecification or WebPageElement. In the latter case, multiple matches within a page can constitute a single conceptual "Web page element".
xpath XPathType An XPath, e.g. of a SpeakableSpecification or WebPageElement. In the latter case, multiple matches within a page can constitute a single conceptual "Web page element".
Properties from Thing
additionalType Text  or
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 style guide.
alternateName Text An alias for the item.
description Text  or
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.

Instances of SpeakableSpecification may appear as a value for the following properties
PropertyOn TypesDescription
speakable Article  or
Indicates sections of a Web page that are particularly 'speakable' in the sense of being highlighted as being especially appropriate for text-to-speech conversion. Other sections of a page may also be usefully spoken in particular circumstances; the 'speakable' property serves to indicate the parts most likely to be generally useful for speech.

The speakable property can be repeated an arbitrary number of times, with three kinds of possible 'content-locator' values:

1.) id-value URL references - uses id-value of an element in the page being annotated. The simplest use of speakable has (potentially relative) URL values, referencing identified sections of the document concerned.

2.) CSS Selectors - addresses content in the annotated page, e.g. via class attribute. Use the cssSelector property.

3.) XPaths - addresses content via XPaths (assuming an XML view of the content). Use the xpath property.

For more sophisticated markup of speakable sections beyond simple ID references, either CSS selectors or XPath expressions to pick out document section(s) as speakable. For this we define a supporting type, SpeakableSpecification which is defined to be a possible value of the speakable property.



Example 1
Example notes or example HTML without markup.
An example of 'speakable' markup (JSON-LD only, initially).
Example encoded as JSON-LD in a HTML script tag.
"@context": "",
"@type": "WebPage",
"name": "Jane Doe's homepage",
"@type": "SpeakableSpecification",
"cssSelector": ["headline", "summary"]
"url": ""
Structured representation of the JSON-LD example.
Example 2
Example notes or example HTML without markup.
An example of speakable markup in Microdata in HTML head section.
Example encoded as Microdata embedded in HTML.
<!DOCTYPE html>
<head rel="home" href="/" itemid=""  itemscope itemtype="">
<title>Example showing complex structures in HTML head</title>
<meta itemprop="cssSelector" content=".title" />
<meta itemprop="xpath" content="/html/body/h3" />
<h1 class="title">Complex Microdata in HTML head</h1>