SCA、JBI之比较

SCA最早是由IBM、BEA、Oracle、SAP四大家发起的规范，现在已经有18家成员加入了此规范，包括SUN; JBI是由SUN主导的规范;区别如下（偶在国外的一个论坛上摘来的，就不翻译了，还是原汁原味的好） ：

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1. Supporters of SCA view JBI as a Java Platform standard that can be helpful in implementing SCA on the Java platform.
2. Supporters of JBI view SCA as providing additional service metadata that can help simplify and standardize service composition within the Java Platform and between the Java Platform and other platforms.
3. Both SCA and JBI are focused on helping developers construct and compose services so it is natural to assume that they are competitors; however, this is not the case. While both can be used separately, they are also effective to use together because they focus on different aspects of the larger service composition problem.
4. The reason this is possible is that SCA and JBI target different audiences. The SCA specifications target end users. They describe how to implement, assemble and deploy applications composed from services. As such, the target audience for these specifications is people working in the roles of developer, assembler and deployer respectively. 
5. SCA allows multiple technologies to be used to implement services (e.g. Java, BPEL, C++) and multiple bindings for communicating with services (e.g. Web services or JMS). However, SCA does not describe how you would introduce a new implementation type or new binding into a runtime. This is exactly where JBI is targeted.
6. JBI is a Java Platform integration 'micro kernel' standard that provides an open architecture in support of multi-vendor Java Composite Application Platform tools and infrastructure. It defines a set of service provider interfaces for middleware providers to implement if they want to install new service engines (which correspond to SCA's implementation types) or binding components (which correspond to SCA's bindings) into a JBI-compliant runtime.[@more@]
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