Which items are included in the data dictionary of a data flow? i. Input and output flowsii. Source/Sinkiii. Data Structure iv. Description

Question

BlackTom AI · Accepted Answer

A data dictionary records the metadata for each named data flow or data store: its origin/destination (source/sink), the precise structure of the data, and a textual description that documents meaning and use.

1) Relevant knowledge points and concepts
- Data dictionary: a repository that defines data elements, data structures, and attributes for items shown on Data Flow Diagrams (DFDs). Typical attributes include name, source/sink (where it comes from or goes to), structure (fields, types, lengths), and a description of the content and purpose.
- Data flows vs. data dictionary entries: data flows are the arrows on a DFD; the dictionary documents what those flows contain and where they originate/terminate.

2) Step-by-step reasoning
- For a given data flow entry, you must record who produces/consumes it (Source/Sink). That is item ii.
- You must specify the composition of the flow (fields, subelements, types), which is the Data Structure (item iii).
- You must include a Description that explains meaning, constraints, or business rules (item iv).
- Item i, "Input and output flows," refers to graphical flows themselves. The dictionary documents the contents and metadata of a single flow rather than listing other separate input/output flows as attributes inside that single entry. Thus i is not a required attribute of a single data-flow dictionary entry.

3) Intermediate steps / examples
- Entry example: SalesOrder (name); Source/Sink: Sales Dept → Order Processing; Structure: OrderNumber (int, 10), ItemList (array of Item), TotalAmount (decimal); Description: Customer order submitted via web portal. This illustrates ii, iii, iv present.

4) Why the correct answer is correct
- ii, iii and iv are the core pieces of metadata that a data dictionary provides for a data flow: origin/destination, structural definition, and descriptive notes.

5) Why other options are incorrect
- B (i, ii, iii, iv) incorrectly adds i as a required attribute for a single entry.
- C (i, iii) omits Source/Sink and Description, which are necessary metadata.
- D (ii, iv) omits Data Structure, which is essential to define the contents of the flow.

Conclusion: The correct selection is A (ii, iii, iv), matching the provided answer.

Which items are included in the data dictionary of a data flow? i. Input and output flowsii. Source/Sinkiii. Data Structure iv. Description单项选择题

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