The portion of ebxml most related to semantic transparency of xml exchange is the registry service, described in the draft registry information model and registry services specifications, which deal with the management and exchange of object-oriented entities . these registries aim at a higher architectural level than the international organization for standards basic semantic registry iso bsr, which i covered in my first column 4rdf允許在內(nèi)存中管理這些模型(這也是到目前為止本系列中一直使用的方法),它也允許在持久存儲(chǔ)(以平面文件的形式存儲(chǔ)的諸如postgresql和oracle這樣的sqldbms中,或存儲(chǔ)在我所編寫(xiě)的實(shí)驗(yàn)性定制rdf后端mangrove中)中管理模型。