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:dir(ltr)

The:dir(ltr)p671

pseudo-class

must match all elements whosedirectionalityp127

is 'ltrp127

:dir(rtl)

The:dir(rtl)p671

pseudo-class

must match all elements whosedirectionalityp127

is 'rtlp127

Another section of this specification defines thetarget elementp798

used with the:targetp798

pseudo-class

Note

This specification does not define when an element matches the:lang()dynamicpseudo-class

, as it is defined in sufficient detail in a

language-agnostic fashion in the Selectors specification.[SELECTORS]p1163

Note

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5Microdata

5.1 Introduction

This section is non-normative.

Sometimes, it is desirable to annotate content with specific machine-readable labels, e.g. to allow generic scripts to provide services that are

customised to the page, or to enable content from a variety of cooperating authors to be processed by a single script in a consistent manner.

For this purpose, authors can use the microdata features described in this section. Microdata allows nested groups of name-value pairs to be added

to documents, in parallel with the existing content.

This section is non-normative.

At a high level, microdata consists of a group of name-value pairs. The groups are calleditemsp677

, and each name-value pair is a property. Items

and properties are represented by regular elements.

To create an item, theitemscopep677

attribute is used.

To add a property to an item, theitempropp679

attribute is used on one of theitem'sp677

descendants.

Markup without the microdata-related attributes does not have any effect on the microdata model.

Properties generally have values that are strings.

Here there are two items, each of which has the property "name":

<p>My name is <span itemprop="name">Elizabeth</span>.</p>

</div>

<p>My name is <span itemprop="name">Daniel</span>.</p>

</div>

Example

These two examples are exactly equivalent, at a microdata level, as the previous two examples respectively:

<p>My <em>name</em> is <span itemprop="name">E<strong>liz</strong>abeth</span>.</p>

</div>

<aside>

<p>My name is <span itemprop="name"><a href="/?user=daniel">Daniel</a></span>.</p>

</aside>

</div>

</section>

Example

Here the item has three properties:

Example

5.1.1 Overview

5.1.2 The basic syntax

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When a string value is aURL

, it is expressed using theap207

element and itshrefp244

attribute, theimgp280

element and itssrcp281

attribute, or

other elements that link to or embed external resources.

When a string value is in some machine-readable format unsuitable for human consumption, it is expressed using thevaluep225

attribute of the

datap225

element, with the human-readable version given in the element's contents.

For numeric data, themeterp500

element and itsvaluep501

attribute can be used instead.

Similarly, for date- and time-related data, thetimep226

element and itsdatetimep226

attribute can be used instead.

Properties can also themselves be groups of name-value pairs, by putting theitemscopep677

attribute on the element that declares the property.

Items that are not part of others are calledtop-level microdata itemsp682

<p>My band is called <span itemprop="band">Four Parts Water</span>.</p>

<p>I am <span itemprop="nationality">British</span>.</p>

</div>

In this example, the item has one property, "image", whose value is a URL:

</div>

Example

Here, there is an item with a property whose value is a product ID. The ID is not human-friendly, so the product's name is used the

human-visible text instead of the ID.

<data itemprop="product-id" value="9678AOU879">The Instigator 2000</data>

</h1>

Example

Here a rating is given using ameterp500

element.

<span itemprop="name">Panasonic White 60L Refrigerator</span>

<div itemprop="aggregateRating"

itemscope itemtype="http://schema.org/AggregateRating">

<meter itemprop="ratingValue" min=0 value=3.5 max=5>Rated 3.5/5</meter>

(based on <span itemprop="reviewCount">11</span> customer reviews)

</div>

Example

In this example, the item has one property, "birthday", whose value is a date:

I was born on <time itemprop="birthday" datetime="2009-05-10">May 10th 2009</time>.

</div>

Example

In this example, the outer item represents a person, and the inner one represents a band:

<p>Name: <span itemprop="name">Amanda</span></p>

<p>Band: <span itemprop="band" itemscope> <span itemprop="name">Jazz Band</span> (<span

itemprop="size">12</span> players)</span></p>

</div>

Example

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Properties that are not descendants of the element with theitemscopep677

attribute can be associated with theitemp677

using theitemrefp678

attribute. This attribute takes a list of IDs of elements to crawl in addition to crawling the children of the element with theitemscopep677

attribute.

Anitemp677

can have multiple properties with the same name and different values.

An element introducing a property can also introduce multiple properties at once, to avoid duplication when some of the properties have the same

value.

It's important to note that there is no relationship between the microdata and the content of the document where the microdata is marked up.

The outer item here has two properties, "name" and "band". The "name" is "Amanda", and the "band" is an item in its own right, with two

properties, "name" and "size". The "name" of the band is "Jazz Band", and the "size" is "12".

The outer item in this example is a top-level microdata item.

This example is the same as the previous one, but all the properties are separated from theiritemsp677

<p id="a">Name: <span itemprop="name">Amanda</span></p>

<p>Size: <span itemprop="size">12</span> players</p>

</div>

This gives the same result as the previous example. The first item has two properties, "name", set to "Amanda", and "band", set to

another item. That second item has two further properties, "name", set to "Jazz Band", and "size", set to "12".

Example

This example describes an ice cream, with two flavors:

<p>Flavors in my favorite ice cream:</p>

<ul>

<li itemprop="flavor">Lemon sorbet</li>

<li itemprop="flavor">Apricot sorbet</li>

</ul>

</div>

This thus results in an item with two properties, both "flavor", having the values "Lemon sorbet" and "Apricot sorbet".

Example

Here we see an item with two properties, "favorite-color" and "favorite-fruit", both set to the value "orange":

<span itemprop="favorite-color favorite-fruit">orange</span>

</div>

Example

There is no semantic difference, for instance, between the following two examples:

<figcaption><span itemscope><span itemprop="name">The Castle</span></span> (1986)</figcaption>

</figure>

<figcaption>The Castle (1986)</figcaption>

</figure>

Example

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This section is non-normative.

The examples in the previous section show how information could be marked up on a page that doesn't expect its microdata to be re-used.

Microdata is most useful, though, when it is used in contexts where other authors and readers are able to cooperate to make new uses of the

markup.

For this purpose, it is necessary to give eachitemp677

a type, such as "http://example.com/person", or "http://example.org/cat", or

"http://band.example.net/". Types are identified asURLs

The type for anitemp677

is given as the value of anitemtypep677

attribute on the same element as theitemscopep677

attribute.

The type gives the context for the properties, thus selecting a vocabulary: a property named "class" given for an item with the type

"http://census.example/person" might refer to the economic class of an individual, while a property named "class" given for an item with the type

"http://example.com/school/teacher" might refer to the classroom a teacher has been assigned. Several types can share a vocabulary. For example,

the types "http://example.org/people/teacher" and "http://example.org/people/engineer" could be defined to use the same

vocabulary (though maybe some properties would not be especially useful in both cases, e.g. maybe the "http://example.org/people/

engineer" type might not typically be used with the "classroom" property). Multiple types defined to use the same vocabulary can be given for a

single item by listing the URLs as a space-separated list in the attribute' value. An item cannot be given two types if they do not use the same

vocabulary, however.

This section is non-normative.

Sometimes, anitemp677

gives information about a topic that has a global identifier. For example, books can be identified by their ISBN number.

Vocabularies (as identified by theitemtypep677

attribute) can be designed such thatitemsp677

get associated with their global identifier in an

unambiguous way by expressing the global identifiers asURLs

given in anitemidp677

attribute.

The exact meaning of theURLs

given initemidp677

attributes depends on the vocabulary used.

Both have a figure with a caption, and both, completely unrelated to the figure, have an item with a name-value pair with the name

"name" and the value "The Castle". The only difference is that if the user drags the caption out of the document, in the former case, the

item will be included in the drag-and-drop data. In neither case is the image in any way associated with the item.

Here, the item's type is "http://example.org/animals#cat":

<h1 itemprop="name">Hedral</h1>

<p itemprop="desc">Hedral is a male american domestic

shorthair, with a fluffy black fur with white paws and belly.</p>

</section>

In this example the "http://example.org/animals#cat" item has three properties, a "name" ("Hedral"), a "desc" ("Hedral is..."), and an "img"

("hedral.jpeg").

Example

Here, an item is talking about a particular book:

<dl itemscope

itemtype="http://vocab.example.net/book"

itemid="urn:isbn:0-330-34032-8">

<dt>Title

<dd itemprop="title">The Reality Dysfunction

Example

5.1.3 Typed items

5.1.4 Global identifiers for items

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This section is non-normative.

Using microdata means using a vocabulary. For some purposes, an ad-hoc vocabulary is adequate. For others, a vocabulary will need to be

designed. Where possible, authors are encouraged to re-use existing vocabularies, as this makes content re-use easier.

When designing new vocabularies, identifiers can be created either usingURLs

, or, for properties, as plain words (with no dots or colons). For

URLs, conflicts with other vocabularies can be avoided by only using identifiers that correspond to pages that the author has control over.

Properties whose names are just plain words can only be used within the context of the types for which they are intended; properties named using

URLs can be reused in items of any type. If an item has no type, and is not part of another item, then if its properties have names that are just plain

words, they are not intended to be globally unique, and are instead only intended for limited use. Generally speaking, authors are encouraged to

use either properties with globally unique names (URLs) or ensure that their items are typed.

<dt>Author

<dd itemprop="author">Peter F. Hamilton

<dt>Publication date

<dd><time itemprop="pubdate" datetime="1996-01-26">26 January 1996</time>

</dl>

The "http://vocab.example.net/book" vocabulary in this example would define that theitemidp677

attribute takes aurn:

URL

pointing to the ISBN of the book.

For instance, if Jon and Adam both write content atexample.com, athttp://example.com/~jon/...and

http://example.com/~adam/...respectively, then they could select identifiers of the form "http://example.com/~jon/name" and

"http://example.com/~adam/name" respectively.

Example

Here, an item is an "http://example.org/animals#cat", and most of the properties have names that are words defined in the context of that

type. There are also a few additional properties whose names come from other vocabularies.

<h1 itemprop="name http://example.com/fn">Hedral</h1>

<p itemprop="desc">Hedral is a male american domestic

shorthair, with a fluffy <span

itemprop="http://example.com/color">black</span> fur with <span

itemprop="http://example.com/color">white</span> paws and belly.</p>

</section>

This example has one item with the type "http://example.org/animals#cat" and the following properties:

Property

Value

name

Hedral

http://example.com/fn

Hedral

desc

Hedral is a male american domestic shorthair, with a fluffy black fur with white paws and belly.

http://example.com/color black

http://example.com/color white

img

.../hedral.jpeg

Example

5.1.5 Selecting names when defining vocabularies

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5.2 Encoding microdata

The microdata model consists of groups of name-value pairs known asitemsp677

Each group is known as anitemp677

. Eachitemp677

can haveitem typesp677

, aglobal identifierp677

(if the vocabulary specified by theitem typesp677

support global identifiers for itemsp677

), and a list of name-value pairs. Each name in the name-value pair is known as apropertyp681

, and each

propertyp681

has one or morevaluesp680

. Eachvaluep680

is either a string or itself a group of name-value pairs (anitemp677

). The names are

unordered relative to each other, but if a particular name has multiple values, they do have a relative order.

EveryHTML elementp43

may have anitemscopeattribute specified. Theitemscopep677

attribute is aboolean attributep65

An element with theitemscopep677

attribute specified creates a newitem, a group of name-value pairs.

Elements with anitemscopep677

attribute may have anitemtypeattribute specified, to give theitem typesp677

of theitemp677

Theitemtypep677

attribute, if specified, must have a value that is anunordered set of unique space-separated tokensp84

that arecase-sensitivep63

each of which is avalid URLp86

that is anabsolute URL

, and all of which are defined to use the same vocabulary. The attribute's value must have at

least one token.

Theitem typesof anitemp677

are the tokens obtained bysplitting the element'sitemtypeattribute's value on spacesp84

. If theitemtypep677

attribute is missing or parsing it in this way finds no tokens, theitemp677

is said to have noitem typesp677

Theitem typesp677

must all be types defined inapplicable specificationsp62

and must all be defined to use the same vocabulary.

Except if otherwise specified by that specification, theURLs

given as theitem typesp677

should not be automatically dereferenced.

Item typesp677

are opaque identifiers, and user agents must not dereference unknownitem typesp677

, or otherwise deconstruct them, in order to

determine how to processitemsp677

that use them.

Theitemtypep677

attribute must not be specified on elements that do not have anitemscopep677

attribute specified.

Anitemp677

is said to be atyped itemwhen either it has anitem typep677

, or it is thevaluep680

of apropertyp681

of atyped itemp677

. Therelevant

typesfor atyped itemp677

is theitemp677

'sitem typesp677

, if it has any, or else is therelevant typesp677

of theitemp677

for which it is apropertyp681

valuep680

Elements with anitemscopep677

attribute and anitemtypep677

attribute that references a vocabulary that is defined tosupport global

identifiers for itemsmay also have anitemidattribute specified, to give a global identifier for theitemp677

, so that it can be related to other

itemsp677

on pages elsewhere on the Web.

Theitemidp677

attribute, if specified, must have a value that is avalid URL potentially surrounded by spacesp86

Theglobal identifierof anitemp677

is the value of its element'sitemidp677

attribute, if it has one,parsedp87

relative to thenode document

of the

element on which the attribute is specified. If theitemidp677

attribute is missing or if resolving it fails, it is said to have noglobal identifierp677

Theitemidp677

attribute must not be specified on elements that do not have both anitemscopep677

attribute and anitemtypep677

attribute

specified, and must not be specified on elements with anitemscopep677

attribute whoseitemtypep677

attribute specifies a vocabulary that does

notsupport global identifiers for itemsp677

, as defined by that vocabulary's specification.

A specification could define that itsitem typep677

can be dereferenced to provide the user with help information, for example. In fact,

vocabulary authors are encouraged to provide useful information at the givenURL

Note

5.2.1 The microdata model

5.2.2 Items

677

The exact meaning of aglobal identifierp677

is determined by the vocabulary's specification. It is up to such specifications to define whether multiple

items with the same global identifier (whether on the same page or on different pages) are allowed to exist, and what the processing rules for that

vocabulary are with respect to handling the case of multiple items with the same ID.

Elements with anitemscopep677

attribute may have anitemrefattribute specified, to give a list of additional elements to crawl to find the name-

value pairs of theitemp677

Theitemrefp678

attribute, if specified, must have a value that is anunordered set of unique space-separated tokensp84

that arecase-sensitivep63

consisting ofIDs

of elements in the sametree

Theitemrefp678

attribute must not be specified on elements that do not have anitemscopep677

attribute specified.

Theitemrefp678

attribute is not part of the microdata data model. It is merely a syntactic construct to aid authors in adding annotations to

pages where the data to be annotated does not follow a convenient tree structure. For example, it allows authors to mark up data in a table

so that each column defines a separateitemp677

, while keeping the properties in the cells.

Note

This example shows a simple vocabulary used to describe the products of a model railway manufacturer. The vocabulary has just five

property names:

product-code

An integer that names the product in the manufacturer's catalogue.

name

A brief description of the product.

scale

One of "HO", "1", or "Z" (potentially with leading or trailing whitespace), indicating the scale of the product.

digital

If present, one of "Digital", "Delta", or "Systems" (potentially with leading or trailing whitespace) indicating that the product has a

digital decoder of the given type.

track-type

For track-specific products, one of "K", "M", "C" (potentially with leading or trailing whitespace) indicating the type of track for

which the product is intended.

This vocabulary has four defineditem typesp677

http://md.example.com/loco

Rolling stock with an engine

http://md.example.com/passengers

Passenger rolling stock

http://md.example.com/track

Track pieces

http://md.example.com/lighting

Equipment with lighting

Eachitemp677

that uses this vocabulary can be given one or more of these types, depending on what the product is.

Thus, a locomotive might be marked up as:

<dl itemscope itemtype="http://md.example.com/loco

http://md.example.com/lighting">

<dt>Name:

<dd itemprop="name">Tank Locomotive (DB 80)

<dt>Product code:

<dd itemprop="product-code">33041

<dt>Scale:

<dd itemprop="scale">HO

Example

678

EveryHTML elementp43

may have anitempropp679

attribute specified, if doing soadds one or more propertiesp681

to one or moreitemsp677

(as

defined below).

Theitempropp679

attribute, if specified, must have a value that is anunordered set of unique space-separated tokensp84

that arecase-sensitivep63

representing the names of the name-value pairs that it adds. The attribute's value must have at least one token.

Each token must be either:

• If the item is atyped itemp677

: adefined property nameallowed in this situation according to the specification that defines therelevant

typesp677

for the item, or

• Avalid URLp86

that is anabsolute URL

defined as an item property name allowed in this situation by a vocabulary specification, or

• Avalid URLp86

that is anabsolute URL

, used as a proprietary item property name (i.e. one used by the author for private purposes, not

defined in a public specification), or

• If the item is not atyped itemp677

: a string that contains no U+002E FULL STOP characters (.) and no U+003A COLON characters (:),

used as a proprietary item property name (i.e. one used by the author for private purposes, not defined in a public specification).

Specifications that introducedefined property namesp679

must ensure all such property names contain no U+002E FULL STOP characters (.), no

U+003A COLON characters (:), and nospace charactersp64

<dt>Digital:

<dd itemprop="digital">Delta

</dl>

A turnout lantern retrofit kit might be marked up as:

<dl itemscope itemtype="http://md.example.com/track

http://md.example.com/lighting">

<dt>Name:

<dd itemprop="name">Turnout Lantern Kit

<dt>Product code:

<dd itemprop="product-code">74470

<dt>Purpose:

<dd>For retrofitting 2 <span itemprop="track-type">C</span> Track

turnouts. <meta itemprop="scale" content="HO">

</dl>

A passenger car with no lighting might be marked up as:

<dt>Name:

<dd itemprop="name">Express Train Passenger Car (DB Am 203)

<dt>Product code:

<dd itemprop="product-code">8710

<dt>Scale:

<dd itemprop="scale">Z

</dl>

Great care is necessary when creating new vocabularies. Often, a hierarchical approach to types can be taken that results in a

vocabulary where each item only ever has a single type, which is generally much simpler to manage.

The rules above disallow U+003A COLON characters (:) in non-URL values because otherwise they could not be distinguished from URLs.

Values with U+002E FULL STOP characters (.) are reserved for future extensions.Space charactersp64

are disallowed because otherwise

the values would be parsed as multiple tokens.

Note

5.2.3 Names: theitempropattribute

679

When an element with anitempropp679

attributeadds a propertyp681

to multipleitemsp677

, the requirement above regarding the tokens applies for

eachitemp677

individually.

Theproperty namesof an element are the tokens that the element'sitempropp679

attribute is found to contain when its value issplit on

spacesp84

, with the order preserved but with duplicates removed (leaving only the first occurrence of each name).

Within anitemp677

, the properties are unordered with respect to each other, except for properties with the same name, which are ordered in the

order they are given by the algorithm that definesthe properties of an itemp681

Theproperty valueof a name-value pair added by an element with anitempropp679

attribute is as given for the first matching case in the

following list:

↪

If the element also has anitemscopep677

attribute

The value is theitemp677

created by the element.

↪

If the element is ametap143

element

The value is the value of the element'scontentp144

attribute, if any, or the empty string if there is no such attribute.

↪

If the element is anaudiop329

,embedp315

,iframep308

,imgp280

,sourcep278

,trackp330

, orvideop325

element

The value is theresulting URL stringp87

that results fromparsingp87

the value of the element'ssrcattribute relative to thenode document

of the element at the time the attribute is set, or the empty string if there is no such attribute or ifparsingp87

it results in an error.

In the following example, the "a" property has the values "1" and "2",in that order, but whether the "a" property comes before the "b"

property or not is not important:

</div>

Thus, the following is equivalent:

</div>

As is the following:

</div>

And the following:

</div>

</div>

Example

5.2.4 Values

680

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