Creating the Logical Data Schema
A big part of the specification of systems is specifying the inputs and outputs of the system as well as what information a system must retain and manage. The input and outputs are data or flows and may be direct flows or may be carried via service requests or responses. Early in the system engineering process, the information captured about these elements is logical. The definition of a logical schema is provided below, along with a set of related definitions.
Definitions
Data Schema: a data or type model of a specific problem domain that includes blocks, value properties, value types, dimensions, units, their relations, and other relevant aspects collectively known as metadata. This model includes a type model consisting of a set of value types, units, and dimensions, and a usage model showing the blocks and value properties that use the type model.
Logical Schema: a data schema expressed independently from its ultimate implementation...
