A data structure diagram (DSD) is the outcome of a process of hierarchical breakdown of a complicated data area, split as far as feasible (and reasonably). If viewed from top to bottom and along the connecting lines, DSDs—which show "may consist of"—relationships between data items—are hierarchical tree diagrams (Diagram 1). The diagram's boxes could symbolize
- Further separated in the figure are intermediate complicated data elements.
fully atomized data objects, symbolized by a field definition in a database table that may be used straight-forwardly
- References to sophisticated data objects covered elsewhere: Rather of enumerating characteristics, a reference to a full entity might be made (entities may be shown by a data structure diagram with just one row of data items - attributes - below the header item). Including a part—that is, a reference to a different data structure diagram—allows one to make reference to many data items.
- States: Conditions Conditions expressed in boxes marked with an acronym on the right hand top of the box specifying one of the following may alter the "consists of" relationship:
- Data items below this box should be read just if the criteria is fulfilled; "EXCL" (= exclusive alternative). same as "IF," however numerous such circumstances exist which are mutually exclusive.
"LOOP": Data item is repeated as stated in the condition multiple times.
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Answered 3 months ago
Ola Hansen
A data structure diagram (DSD) is the outcome of a process of hierarchical breakdown of a complicated data area, split as far as feasible (and reasonably). If viewed from top to bottom and along the connecting lines, DSDs—which show "may consist of"—relationships between data items—are hierarchical tree diagrams (Diagram 1). The diagram's boxes could symbolize
fully atomized data objects, symbolized by a field definition in a database table that may be used straight-forwardly
"LOOP": Data item is repeated as stated in the condition multiple times.
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