Source: Schema.org v30.1 vocabulary. Official spatial property definition.
What does spatial mean?
The "spatial" property can be used in cases when more specific properties (e.g. [[locationCreated]], [[spatialCoverage]], [[contentLocation]]) are not known to be appropriate.
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