identifier
Estimated domains
Description
The identifier property represents any kind of identifier for any kind of 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](/docs/datamodel.html#identifierBg) for more details.
Definition from the Schema.org vocabulary (English).
Trend over time
At least two months are needed to show a trend. The series will grow with every monthly update.
Usage in Google Search
Documented Google contexts where this property is required or recommended for rich results.
- Requiredvacation-rental
Text A unique identifier for the property. Additional guidelines: The identifier must be independent of the listing content; for example, it won't change when the property owner updates the listing name or number of bedrooms. The same identifier must be used for the same listing in different languages.
- Recommendeddataset
URL, Text, or PropertyValue An identifier, such as a DOI or a Compact Identifier. If the dataset has more than one identifier, repeat the identifier property. If using JSON-LD, this is represented using JSON list syntax.
- Recommendedjob-posting
PropertyValue The hiring organization's unique identifier for the job. For example: "identifier": { "@type": "PropertyValue", "name": "MagsRUs Wheel Company", "value": "1234567" }
- Recommendedprofile-page
Text Any unique identifier that's used within your site, if applicable. This could be an internal database ID that your site uses to identify a user even if their social media handle changes.
Used on types
Tiers indicate the number of unique domains using the term. They are intentionally approximate to reduce noise and protect site privacy. How to read the data.