Entity Linking Methods

Broadly speaking, an entity is a person, place, thing or concept. In Linked data terms, an entity is an object that is identified by a URI. Schema App creates entities for your content through the application of schema markup where each “@id” is a URI. Your markup can be enhanced by connecting your entities to other entities from authoritative knowledge bases like Wikipedia, Wikidata, and Google’s Knowledge Graph. Schema App is currently capable of linking to external entities with the following methods.

TABLE OF CONTENTS

• 1. Schema App Editor
• 2. Schema App Highlighter - Fixed entities
• 3. Schema App Highlighter - Omni Linked Entity Recognition (LER)
• 4. Schema App Advanced WordPress Plugin - Categories and Tags

1. Schema App Editor

Individual data items can be linked to authoritative knowledge bases using properties like sameAs and additionalType (for more information see How to use the additionalType and sameAs properties). Entities are also commonly linked to properties that expect a place; for example, addressCountry, areaServed, or location.

This approach is static, but not scalable.

2. Schema App Highlighter - Fixed entities

Entities can be added to the entire page set of any Highlighter template using the “Add Fixed Property” function. Note: This should only be applied if deployment parameters can ensure the entity is relevant to all URLs in the page set. 

This approach is static and scalable.

3. Schema App Highlighter - Omni Linked Entity Recognition (LER)

Omni LER tags can be applied to Schema App’s Highlighter templates. Once applied, Omni LER runs text through an API to identify linked entities. If entities are recognized, the API returns URIs from the following sources, connected to your content using the sameAs property:

• Wikipedia entity (e.g. https://en.wikipedia.org/wiki/DeWalt)

• Wikidata entity (e.g. https://www.wikidata.org/entity/Q847270)

• Google Knowledge Graph entity (e.g. kg:/m/0clyyj)
  
  

This approach is dynamic and scalable.

For more information about LER implementation and best practices, see the Omni Linked Entity Recognition (LER) Explainer.

4. Schema App Advanced WordPress Plugin - Categories and Tags

Automatically map WordPress Categories and Tags to existing Wiki entities using Schema App's Advanced WordPress plugin. Categories will be mapped to your automated BlogPosting Schema Markup using the about property, and Tags will be mapped using the mentions property. 

This approach is dynamic and scalable, but only available to WordPress websites. 

5. Schema App Highlighter - Lookup Page Markup

If one wants all content from another page they can use the TagLookup functionality which will work just like link existing data item functionality in the highlighter but allow for the criteria to vary based on xpath content. This can be used to dynamically lookup content from a related page on a different URL.  See here for full documentation: https://support.schemaapp.com/a/solutions/articles/33000256996 

For more information, see the article How To: Automate Entity Linking in WordPress.