Data Dictionary Essay

945 Words2 Pages

(Chapter-8)

1.Define the term data dictionary. Define metadata.
Data dictionary is a reference one of data which represents the same data itself.Metadata is a set of data that describes and gives information about other data.

2. What are four reasons for compiling a complete data dictionary?
The four reasons for compiling a complete data dictionary are as follows:
a.Check the dataflow diagram for completeness and accuracy
b. Providing a starting point for developing screens and reports
c.Determing the contents of data stored in files and
d.To develop the logic for data flow diagram process

3. What information is contained in the data repository?
The data repository contains information which is about the data maintained by the system including data flow diagrams, data stores, etc. It also contains procedural logic and use cases; screen and report design; data relationships; project requirements and project management information, such as delivery schedules, etc.On a whole it contains everything about data flow diagrams which makes a system work better

4. What is a structural record?
The reason for structural record is to be created is that when data flow base elements are grouped simultaneously

5. List the eight specific categories that each entry in the data dictionary should contain. Briefly give the definition of each category.
The eight specific categories that each entry in data dictionary should contain mandatorily are as follows:
a.Element ID- This is an optional one which can be assigned or not
b.The name of the element -this is a unique way to name the element in the data dictionary.
c.A description of the element- this describes what the element is like and what it type does.
d.The type of data -this shows if ...

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...used to determine whether the XML document content is valid (whether it confirms to the order and type of data that must be present in the document) or not

16. How does a document type definition help to ensure that an XML document contains all necessary elements?
It validates the XML document using standard XML tools. The DTD is easier to create if a data dictionary has been completed.

17. When should attributes be used in an XML document?
The situation of using attributes in an XML document is when the keyword #REQUIRED is present. Whereas #IMPLIED means that an attribute is optional

18. What does an ID attribute ensure?
The ID attribute ensures to check and make sure an ID starts with a letter or an underscore and cannot be by a number

19. What does an IDREF attribute validate?
IDREF links one element with another which is usually termed as ID

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