NATIONAL OPEN UNIVERSITY OF NIGERIA

UNIVERSITY VILLAGE, PLOT 91, CASDASTRAL ZONE, NNAMDI AZIKIWE EXPRESS WAY, JABI, ABUJA.
FACULTY OF SCIENCES
JANUARY 2021 EXAMINATION

COURSE CODE: DAM 344
COURSE TITLE: SEMANTIC DATA MODELING
CREDIT: 2 UNITS
TIME ALLOWED: 2 HOURS
INSTRUCTION: ANSWER QUESTION 1 AND ANY OTHER THREE (3) QUESTIONS

1a. In not less than half a page, elaborate on the process of data modelling highlighting its main application. (6 marks)
ai) Enumerate the types of data modelling (2 marks)
aii) Expressly outline the process of data modelling (3 marks)
b. Based on what you have learnt from the course, explain the term ‘database’ (2 marks)
bi. State the two forms of objects with one example each. (2 marks)
bii. A common term employed in Sematic Data Modeling is ‘category’. Write on this term and state one difference between abstract category and concrete category. (4 marks)
ci. Define HM-Data Model and HC-Data Model briefly. (2 marks)
cii. Elaborate the concept of WBT-Master. (4 marks)

2a) Elucidate on the following: Identifier, Modifier and Descriptor. (3 marks)
bi. Semantic network may be used as a component of two different information-processing tasks. List them. (2 marks)
bii List FIVE tools that WBT-Master provides. (5 marks)
ci. Describe an attribute. (3 marks)
cii. Define semantic data modelling. (2 marks)

3a. Expound on the concept of attributes (5 marks)
b. Briefly explain the three abstraction that are key for data modelling. (6 marks)
c. Give clear differences between static restriction and dynamic restriction. (4 marks)

4a. State and briefly describe in a tabular form the 5 commands used in semantic data language. (5 marks)

b. Enumerate and write briefly on the 4 forms of organisations of semantic data models. (4 marks)

c. Mention and elucidate on the 3 factors that influence the effectiveness of semantic modelling. (6 marks)

5a. State and briefly describe the THREE challenges of a shared Data Model (6 marks)

b. What is the collibra Software. (3 marks)

c. Mention three (3) of the Business Semantics Management product suite, Briefly Explain any one of them. (6 marks)