# identifier - Schema.org Property

> Source: https://schema.org/identifier
> Extracted: 2026-02-16T18:46:42.220Z

---

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**\[more...\]**

-   Canonical URL: https://schema.org/identifier
-   Equivalent Property: cmns-id:identifiedBy  
    Equivalent Property: dcterms:identifier
-   [Check for open issues.](https://github.com/schemaorg/schemaorg/issues?q=is%3Aissue+is%3Aopen+identifier)

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.

### Used on these types

`-   [Thing](https://schema.org/Thing "Thing")`

#### Sub-properties

-   [accountId](https://schema.org/accountId "accountId")
-   [asin](https://schema.org/asin "asin")
-   [callSign](https://schema.org/callSign "callSign")
-   [confirmationNumber](https://schema.org/confirmationNumber "confirmationNumber")
-   [duns](https://schema.org/duns "duns")
-   [editEIDR](https://schema.org/editEIDR "editEIDR")
-   [flightNumber](https://schema.org/flightNumber "flightNumber")
-   [globalLocationNumber](https://schema.org/globalLocationNumber "globalLocationNumber")
-   [gtin](https://schema.org/gtin "gtin")
-   [gtin12](https://schema.org/gtin12 "gtin12")
-   [gtin13](https://schema.org/gtin13 "gtin13")
-   [gtin14](https://schema.org/gtin14 "gtin14")
-   [gtin8](https://schema.org/gtin8 "gtin8")
-   [hasGS1DigitalLink](https://schema.org/hasGS1DigitalLink "hasGS1DigitalLink")
-   [isbn](https://schema.org/isbn "isbn")
-   [issn](https://schema.org/issn "issn")
-   [legislationIdentifier](https://schema.org/legislationIdentifier "legislationIdentifier")
-   [leiCode](https://schema.org/leiCode "leiCode")
-   [nsn](https://schema.org/nsn "nsn")
-   [orderNumber](https://schema.org/orderNumber "orderNumber")
-   [productID](https://schema.org/productID "productID")
-   [serialNumber](https://schema.org/serialNumber "serialNumber")
-   [sku](https://schema.org/sku "sku")
-   [taxID](https://schema.org/taxID "taxID")
-   [titleEIDR](https://schema.org/titleEIDR "titleEIDR")
-   [usNPI](https://schema.org/usNPI "usNPI")

### Examples

Example notes or example HTML without markup.

<p>
Title: Library linked data in the cloud : OCLC's experiments with new models of resource description<br/>
Author: Carol Jean Godby<br/>
ISBN: 9781627052191<br/>
oclcnum: 889647468<br/>
Details: <a href="http://www.worldcat.org/oclc/889647468">WorldCat.org</a>
</p>

Example encoded as [Microdata](https://en.wikipedia.org/wiki/Microdata_\(HTML\)) embedded in HTML.

<div itemscope itemtype="https://schema.org/Book">
    Title: <span itemprop="name">Library linked data in the cloud : OCLC's experiments with new models of resource description</span><br>
    Author: <span itemprop="author">Carol Jean Godby</span><br>
    ISBN: <span itemprop="isbn">9781627052191</span><br>
    <div itemscope itemprop="identifier" itemtype="https://schema.org/PropertyValue">
        <span itemprop="propertyID">OCoLC</span>: <span itemprop="value">889647468</span>
    </div><br>
    Details: <a itemprop="sameAs" href="http://www.worldcat.org/oclc/889647468">WorldCat.org</a>
</div>

Example encoded as [RDFa](https://en.wikipedia.org/wiki/RDFa) embedded in HTML.

<div vocab="https://schema.org/" typeof="Book">
    Title: <span property="name">Library linked data in the cloud : OCLC's experiments with new models of resource description</span><br>
    Author: <span property="author">Carol Jean Godby</span><br>
    ISBN: <span property="isbn">9781627052191</span><br>
    <div property="identifier" typeof="PropertyValue">
        <span property="propertyID">OCoLC</span>: <span property="value">889647468</span>
    </div>
</div>
    <br>
    Details: <a property="sameAs" href="http://www.worldcat.org/oclc/889647468">WorldCat.org</a>

Example encoded as [JSON-LD](https://en.wikipedia.org/wiki/JSON-LD) in a HTML script tag.

{
 "@context": "https://schema.org/",
 "@type": "Book",
 "name": "Library linked data in the cloud : OCLC's experiments with new models of resource description",
 "author": "Carol Jean Godby",
 "isbn": "9781627052191",
 "identifier": {
 "@type": "PropertyValue",
   "propertyID": "OCoLC",
   "value":  "889647468"
  },
 "sameAs": "http://www.worldcat.org/oclc/889647468"
}

Structured representation of the JSON-LD example.

Example notes or example HTML without markup.

<div">
Company Record
<h1>A UK Organization Ltd</h1>
Registered office address: 1 A Street, London<br/>
Company Number: 99065782
</div>

Example encoded as [Microdata](https://en.wikipedia.org/wiki/Microdata_\(HTML\)) embedded in HTML.

<div itemscope itemtype="https://schema.org/LocalBusiness">
    Company Record
    <h1 itemprop="name">A UK Organization Ltd</h1>
    Registered office address: <span itemprop="address">1 A Street, London</span><br>
    <div itemscope="" itemprop="identifier" itemtype="https://schema.org/PropertyValue">
        <span itemprop="propertyID">Company Number</span>: <span itemprop="value">99065782</span>
    </div><br>
</div>

Example encoded as [RDFa](https://en.wikipedia.org/wiki/RDFa) embedded in HTML.

<div vocab="https://schema.org/" typeof="LocalBusiness">
    Company Record
    <h1 property="name">
        A UK Organization Ltd</h1>
        Registered office address: <span property="address">1 A Street, London</span><br>
    <div property="identifier" typeof="PropertyValue">
        <span property="propertyID">Company Number</span>: <span property="value">99065782</span>
    </div><br>
</div>

Example encoded as [JSON-LD](https://en.wikipedia.org/wiki/JSON-LD) in a HTML script tag.

{
  "@context": "https://schema.org/",
  "@type": "LocalBusiness",
  "name": "A UK Organization Ltd",
  "address": "1 A Street, London",
  "identifier": {
    "@type": "PropertyValue",
    "propertyID": "Company Number",
    "value":  "99065782"
  }
}

Structured representation of the JSON-LD example.