Schema Markup: Making Trustworthy Information Explicit
Schema markup helps describe visible entities and content in a machine-readable form. This guide explains alignment, validation, and the limits of treating markup as trust.
Schema markup helps describe page content and entities in a machine-readable form. Adding Organisation schema to a homepage makes explicit claims about the organisation; those claims should match visible content and, where relevant, authoritative references. A compatible system may use the information for interpretation, but schema alone is not a universal trust declaration or provider ranking signal.
How AI Systems Use Schema for Trust Scoring
Completeness, accuracy, and verifiability are useful review questions for schema claims. A sameAs link can help people or compatible systems locate an external reference, while missing or contradictory fields create an evidence gap. These checks support clearer interpretation; they do not establish that every AI system assigns a trust score or that complete markup increases trust.
The Schema Trust Alignment Principle
Schema Trust Alignment is the principle that every claim in your schema markup must be verifiable from your body text and from external sources. A schema that claims an aggregate rating of 4.8/5 when no review content is present on the page triggers a schema manipulation signal. A schema that names an author who is not mentioned in the article body triggers an entity inconsistency signal. A schema that describes a product as "industry-leading", a qualitative claim with no measurable basis, contributes nothing to trust scoring. Every schema attribute should reflect a verifiable reality, not an aspiration.
▲Aggregate rating markup should accurately represent visible, eligible review content and follow the relevant platform guidelines. Do not add ratings that cannot be supported by the page or its review source; no universal review count is established here.
Schema Completeness by Page Type
- Homepage / About: Organisation with name, url, foundingDate, address, sameAs (Wikipedia/Wikidata), contactPoint
- Blog posts / Articles: Article or BlogPosting with author (Person schema), datePublished, dateModified, publisher
- Product pages: Product with name, description, offers (price, availability), aggregateRating (if reviews present)
- Service pages: Service with provider (Organisation), description, areaServed
- FAQ sections: FAQPage with Question and acceptedAnswer pairs
- Local business: LocalBusiness with name, address, telephone, openingHours, geo coordinates
Testing Schema Trust Alignment
For each schema attribute on important pages, ask: is the claim supported by visible content, and can its source be explained where relevant? Inconsistency is a quality and maintenance problem for readers and systems to investigate, not proof of a universal trust penalty. Remove unsupported fields or bring them into alignment with the page.