Source: Schema.org v30.1 vocabulary. Official variantCover property definition.
What does variantCover mean?
A description of the variant cover for the issue, if the issue is a variant printing. For example, "Bryan Hitch Variant Cover" or "2nd Printing Variant".
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