Standards
Data Sources
The sources behind every SchemaReel page, grouped by what they are trusted for. Each page lists the specific documents it relies on, with dates.
Google Search
- Google Search Central structured data documentation: introduction, general guidelines, Organization, Article, Breadcrumb, Review snippet, site names.
- The documentation updates log, for dates of changes.
- AI features and your website.
Vocabulary and formats
- Schema.org type and property pages, version 30.1 (September 16, 2026) where the version is shown.
- W3C JSON-LD 1.1, a W3C Recommendation since July 16, 2020.
- The Schema Markup Validator announcement, May 21, 2021.
Gambling and consumer rules
- United States: the FTC rule on consumer reviews and testimonials.
- United Kingdom: the Digital Markets, Competition and Consumers Act 2024, Schedule 20 and the CMA's fake reviews guidance (CMA208), with a law firm summary as a secondary source.
- Canada: Competition Bureau Deceptive Marketing Practices Digest; iGaming Ontario; AGCO.
- Australia: the ACCC and government guidance on the Interactive Gambling Act.
Secondary sources
Used only when a primary source cannot be read, and named in the text: for example, Google's statements on the sitelinks search box are quoted as reported by Search Engine Journal, because the original blog post did not load in our research tools. These cases are listed in our issues log and rechecked by hand.
What we do not use
Operator or vendor marketing as proof of facts, unattributed statistics, paid placements, scraped data and affiliate feeds.