An approach for specifying data in a standards style pattern of Service-Oriented Architecture (SOA) environments is provided. The approach implemented in a computer infrastructure, includes defining an interface including one or more local data elements and one or more references to one or more common data elements, of a service, the one or more common data elements being defined in a library for a plurality of services. The approach further includes configuring a data definition file (DDF) which indicates whether each of the one or more local data elements and the one or more common data elements is mandatory for the service. The approach further includes validating one or more data elements from a consumer as mandatory for the service based on the configured DDF.