Introduction to Classes of Data Items
Basically there are three classes of data items to be considered, as shown fig 3.15,
Data Element: The smallest unit of data that cannot be further decomposed.
Data Structure: Once data items have defined the data structure required by the particular system under consideration can be identified. The terms normally used to define data structures are:
Database: A collection of records which are interrelated for purposes of processing to meet use requirements. For an example in a deliveries database, the delivery record would be interrelated with the order record product record customer record and invoice record, in such a way to minimize duplication of data.
Data Stores and Data Flows: Data stores and data flows are made up of data structures and elements. Consequently, data store and flow entries contain data structure and data elements. The data is these entries are described using any of the above notations. Entries about data stores and flows also include other references. For example, the data flow description contains the origin and destination of the data flow. It also contains the physical description of the data flow, in this case stating that it takes the form of paper invoices. Data store descriptions also contain physical information, such as the medium used to store the data and where it is located.
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