Open service interface definition
Description
Open Service Interface Definitions (OSIDs) are programmatic interface specifications describing services. These interfaces are specified by the Open Knowledge Initiative (O.K.I.) to implement a Service Oriented Architecture (SOA) to achieve interoperability among applications across a varied base of underlying and changing technologies.
To preserve the investment in development, program logic is separated from underlying technologies through the use of software interfaces each of which defines a contract between a service consumer and a service provider. This separation is the basis of any valid SOA. While some methods define the service interface boundary at a protocol or server level, OSIDs place the boundary at the application level to effectively insulate the consumer from protocols, server identities, and utility libraries that are in the domain to a service provider resulting in software which is easier to develop, longer lasting, and usable across a wider array of computing environments.
OSIDs assist in software design and development by breaking up the problem space across service interface boundaries. Because network communication issues are addressed within a service provider and not at the interface, there isn't an assumption that every service provider implement a remote communications protocol (though many do). OSIDs are also used for communication and coordination among the various components of complex software which provide a means of organizing design and development activities for simplified project management.
OSID providers (implementations) are often reused across a varied set of applications. Once software is made to understand the interface contract for a service, other compliant implementations may be used in its place. This achieves reusability at a high level (a service level) and also serves to easily scale software written for smaller more dedicated purposes.
Service Definitions
- Agent OSID
- Assessment OSID
- Authentication OSID
- Authorization OSID
- CourseManagement OSID
- Repository OSID
- Scheduling OSID
Workflow
The Workflow OSID defines interfaces for managing a process comprised of a sequence of steps of sub-processes.
User Messaging
The User Messaging OSID defines interfaces for transporting messages among users or systems.
Grading
The Grading OSID defines interfaces for submitting grade reports.
Hierarchy
The Hierarchy OSID defines interfaces for managing arbitrary collections of objects.
Identity
The Id OSID defines an interface for managing identitifiers of objects.
Filing
The Filing OSID defines interfaces for manging files in file systems.
Logging
The Logging OSID defines interfaces for reading and writing log files.
References
- Open Knowledge Initiative: O.K.I.
- Baving, T., Cook, D., Green, T. 2005. Integrating the Educational Enterprise.
- Kraan, W. 2005. O.K.I. and IMS, wires and sockets revisited.
- Kahn, J. 2005. Screen Shots: Repository OSID Interoperability.
- Kumar, V., Merriman, J., Thorne, S. 2004. Open Knowledge Initiative Final Report.
- Kahn, J. 2005. Repository Developer's Guide.
- Coppeto, T. 2005. OSID 2.0 Design Patterns: OSID Layering.
- Kahn, J. 2005. Managing Complexity and Surviving Technology Change.