itemid
The itemid
global attribute provides microdata in the form of a unique, global identifier of an item.
An itemid
attribute can only be specified for an element that has both itemscope
and itemtype
attributes. Also, itemid
can only be specified on elements that possess an itemscope
attribute whose corresponding itemtype
refers to or defines a vocabulary that supports global identifiers.
The exact meaning of an itemtype
's global identifier is provided by the definition of that identifier within the specified vocabulary. The vocabulary defines whether several items with the same global identifier can coexist and, if so, how items with the same identifier are handled.
Examples
Representing structured data for a book
This example uses microdata attributes to represent the following structured data:
itemscope | itemtype: itemid | https://schema.org/Book: urn:isbn:0-374-22848-5 | |
itemprop | title | Owls of the Eastern Ice | |
itemprop | author | Jonathan C Slaght | |
itemprop | datePublished | 2020-08-04 |
HTML
html
<dl
itemscope
itemtype="https://schema.org/Book"
itemid="urn:isbn:0-374-22848-5<">
<dt>Title</dt>
<dd itemprop="title">Owls of the Eastern Ice</dd>
<dt>Author</dt>
<dd itemprop="author">Jonathan C Slaght</dd>
<dt>Publication date</dt>
<dd>
<time itemprop="datePublished" datetime="2020-08-04">August 4 2020</time>
</dd>
</dl>
Result
Specifications
Specification |
---|
HTML Standard # attr-itemid |
Browser compatibility
BCD tables only load in the browser
See also
- All global attributes.
- Other microdata related global attributes: