where {application} is the application’s name. The request must include the application’s modified schema in XML or JSON as specified by the request’s content-type header. Because an application’s name cannot be changed, {application} must match the application name in the schema. An application’s key cannot be changed either, hence if the application was defined with a key, the same key must be provided. If application was defined without a key, a key can be added by including it in the updated schema. If the request is successful, a 200 OK response is returned with no message body.Modifying an application replaces its current schema. If any previously-defined tables or fields are omitted in the new schema, those tables/fields can no longer be referenced in queries, but existing data is not modified or deleted. Data is deleted only when an object is explicitly deleted, the owning shard is explicitly deleted, or shard is automatically deleted due to data aging.