It's still a draft (and if I may nit-pick, an expired draft). It only has "complete structural validation". Which means it doesn't feature custom types. Altho

It's still a draft (and if I may nit-pick, an expired draft). It only has "complete structural validation". Which means it doesn't feature custom types. Although it adds a workaround for the date issue by adding a handful of supported sub-types (http://json-schema.org/latest/json-schema-validation.html#anchor104 http://json-schema.org/latest/json-schema-validation.html#an...) It is far from what validation XML Schemas offer.