8. A computer for a service-oriented architecture (SOA) system which provides service offerings categorized according to service categories using a taxonomy, comprising: a memory; and a processor cooperatively operable with the memory, and configured to, based on instructions stored in the memory, receive, in a specification field, a formal definition of a service, the formal definition is for inclusion to define one of service offerings of the SOA system; determine a current grammar which is currently in effect as a specification-requirement of acceptable definitions for a service category in which the service is categorized according to a taxonomy of the SOA system, the current grammar being a common grammar, determine whether the formal definition in the specification field is acceptable, by adhering to the current grammar determined to be currently in effect as the specification-requirement for the category of the service; when the formal definition in the specification field is determined to be acceptable according to the current grammar: accept, automatically without manual intervention, in response to determining that the formal definition is acceptable, for inclusion to define the service in the SOA system, the formal definition in the specification field for the service; modify, automatically without manual intervention, in response to determining that the formal definition is acceptable, the current grammar for the taxonomy of the SOA system to provide an updated grammar for the SOA system in which the formal definition of the service that was received in the specification field is now categorized in the service category; and use, in governance of the SOA, the updated grammar as the current grammar which defines service offerings of the SOA system in which the formal definition of the service that was received in the specification field is now categorized in the service category; and when the formal definition is determined to be not acceptable according to the current grammar: reject, automatically without manual intervention, in response to determining that the formal definition is acceptable, for the service offerings of the SOA system, the formal definition in the specification field for the service.
12. The computer of claim 8 , wherein the processor is further configured to modify the current grammar to provide an updated grammar, store the updated grammar to use as the current grammar for the service; and evaluate, for the service, the formal definition, which was acceptable under a previous grammar, according to the current grammar which is now updated.