Source: Schema.org v30.1 vocabulary. Official subStageSuffix property definition.
What does subStageSuffix mean?
The substage, e.g. 'a' for Stage IIIa.
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