# Schema.org core and all extension vocabularies (SCHEMA)

> A collection of schemas that webmasters can use to markup HTML pages in ways recognized by major...

- Page: https://library.schematica.io/model/165b8f395856464790583b7d837486fa
- Model type: Ontology
- License: Apache 2.0
- Access type: Free
- Access method: Download
- Model size: Mid
- Formats: OWL
- Domains: Tech / IT
- Audiences: Developer, Researcher
- External link: https://bioportal.bioontology.org/ontologies/SCHEMA
- Contact: Josef Hardi (johardi@stanford.edu)
- Listed in library: 2025-06-12
- Last updated: 2025-09-10

## Description

## Ontology Info

| Field | Value |
|-------|-------|
| Acronyme | SCHEMA |
| Description | A collection of schemas that webmasters can use to markup HTML pages in ways recognized by major search providers, and that can also be used for structured data interoperability (e.g. in JSON). This representation includes all layers, as presented in the experimental OWL file at https://schema.org/docs/schemaorg.owl. <br>Versions containing -fixes in their names include the fixes described at https://github.com/schemaorg/schemaorg/issues/1611#issuecomment-299292010.  |
| Format | OWL |
| Categories | Vocabularies |
| Groups | Bibliographic Materials Group |

## Metrics

| Metric | Value |
|--------|-------|
| Classes | 822 |
| Individuals | 989 |
| Properties | 1,319 |
| Max Depth | 5 |
| Max Child Count | 61 |
| Average Child Count | 5 |
| Classes With One Child | 45 |
| Classes With More Than 25 Children | 6 |
| Classes With No Definition | 19 |

## Projects using SCHEMA

- [WPHH (WSMIO)](https://bioportal.bioontology.org/projects/WSMIO)

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Source: https://library.schematica.io/model/165b8f395856464790583b7d837486fa