Source: Schema.org v30.1 vocabulary. Official proficiencyLevel property definition.
What does proficiencyLevel mean?
Proficiency needed for this content; expected values: 'Beginner', 'Expert'.
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