The Abstraction Layer represents domain and application abstractions.'Conceptual package' represent business domain knowledge and business rules, insofar as this information can be mined from existing applications. These packages are aligned with another OMG specification, called Semantics of Business Vocabulary and Business Rules (SBVR)'Structure package' describes the meta-model elements for representing the logical organization of the software system into subsystems, layers and components'Build package' represents the engineering view of the software system
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