| Interface | Description | 
|---|---|
| Service<I,R> | Service call with I input type and R return type. | 
| Service.DirectoryService<I> | Meta-service to list and describe registered callable services. | 
| Service.DirectoryService.Params | |
| Service.Exceptions | |
| Service.ServiceFactory<I,R> | The service factory creates instances of callable services based on the desired execution type. | 
| Class | Description | 
|---|---|
| Service.ServiceCallContext | Context information for service call invocation. | 
| ServiceRegistry | A basic service registry implementation used by  CallStep. | 
| Enum | Description | 
|---|---|
| Service.Type | Service calls can appear at the start of a traversal or mid-traversal. | 
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