Source: Schema.org v30.1 vocabulary. Official materialExtent property definition.
What does materialExtent mean?
The quantity of the materials being described or an expression of the physical space they occupy.
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