B Model-Driven Architecture (MDA) at Eclipse in Java

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APPENDIX B Model-Driven Architecture (MDA) at Eclipse
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With respect to mapping definitions for example, the myriad mappings from UML2 Profiles to Information Management Metamodel (IMM) (among others) should QVT be provided as part of these specifications
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Specification Compliance
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A generally provided set of conformance criteria must be met when implementing a specification With improved collaboration between implementation and specification organizations, some level of minimum compliance level can be expected, to provide a proper reference implementation In some cases today, implementations at Eclipse are well aligned, or nearly aligned, with OMG specifications For example, the Eclipse UML2 project provides a compliant implementation of the UML 21 metamodel using the nearly EMOF-compliant Eclipse EMF project Should implementations be required to provide the highest level of compliance to defined specification acceptance criteria Or is a best effort approach adequate What actions can or should be taken to provide specification alignment or conformance
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Implementations Influencing Specifications
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As indicated previously, in some cases, existing implementations are close to a specification yet are not fully compliant With a large existing client base on a high-quality, open source implementation, why not align a specification with the implementation For example, consider the previously mentioned case of EMF s Ecore model being not quite aligned with the EMOF specification A precedent exists for this type of influence between an open source implementation and OMG specification in the UML The DI and Diagram Definition RFP are two more areas where this type of cooperation can be mutually beneficial Most often, specifications are themselves driven from implementations, although typically from a commercial vendor Wouldn t an open source approach to implementations influencing specifications be a more equitable solution This leads us directly to the next topic
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Open and Transparent Nature
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In the case of Eclipse, contributions are done in the open, with an emphasis on meritocracy as the basis for achieving more responsibility within the community
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Future Outlook
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Transparency is essential to the open source process at Eclipse, yet this is somewhat different from the specification development process at the OMG [21] Perhaps this is an area in which the two organizations can influence one another If the development of a reference implementation were done in the open, it follows that the developing version of the specification itself must be available Otherwise, there would need to be a serial process of first developing the specification, publishing it, and then implementing it, which eliminates the benefits of validating the specification while developing an implementation in parallel Can the process of developing standards be done in a more open and transparent manner, with an emphasis on addressing the needs of a developing reference implementation Alternatively, could Eclipse support a model whose source is not open until it reaches a required level of alignment with ongoing specification work
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Future Outlook
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In summary, the promise of MDA can be realized to a large extent today using the capabilities provided by the Eclipse Modeling Project As MDA encompasses a collection of specifications that align well with the implementation goals of the Eclipse Modeling Project, the future of delivering a solid open source infrastructure for MDA tooling seems bright Practically speaking, many challenges remain before realizing the statement in the Modeling project s charter related to its relationship with standards bodies such as the OMG A relationship that is too informal will not likely yield the desired results, whereas a relationship that is strictly defined and enforced will likely limit the progress of implementation The right balance will clearly benefit both of these organizations, their members, and, ultimately, the customers of standards-based commercial products
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References
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[1] Object Management Group (OMG), wwwomgorg [2] Eclipse Modeling Project, wwweclipseorg/modeling [3] OMG Specification and Products, wwwomgorg/gettingstarted/ specsandprodshtm#SpecProd [4] Software Process Engineering Metamodel (SPEM) specification, wwwomgorg/technology/documents/modeling_spec_catalog htm#SPEM [5] Eclipse Process Framework (EPF), wwweclipseorg/epf/ [6] Unified Modeling Language (UML) specification, wwwomgorg/ technology/documents/modeling_spec_cataloghtm#UML [7] Eclipse UML2 Project, wwweclipseorg/uml2 [8] Eclipse Model Development Tools (MDT) Project, wwweclipseorg/mdt [9] Object Constraint Language (OCL) specification, wwwomgorg/ technology/documents/modeling_spec_cataloghtm#OCL [10] EMF Technology OCL Project, wwweclipseorg/emft/projects/ocl#ocl
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