"If you are messing around near StructuredValue, it would probably be worthwhile to fix up the comment on StructuredValue, which says that structured values are strings, but all the subclasses of StructuredValue are not strings." -- http://lists.w3.org/Archives/Public/public-vocabs/2014Aug/0205.html

http://schema.org/StructuredValue "Structured values are strings—for example, addresses—that have certain constraints on their structure."

Subtypes:

More specific Types
ContactPoint
GeoCoordinates
GeoShape
NutritionInformation
OpeningHoursSpecification
OwnershipInfo
PriceSpecification
QuantitativeValue
TypeAndQuantityNode
WarrantyPromise