Source: Schema.org v30.1 vocabulary. Official knows property definition.
What does knows mean?
The most generic bi-directional social/work relation.
Used on types (domainIncludes)
Expected value types (rangeIncludes)
Schema.org domainIncludes and rangeIncludes are descriptive guidance, not strict validation prohibitions. Check the official reference for updates.
Related reference
Browse all Schema.org types and properties · Google feature support status