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Question to Svetlana Petrova and to those who know these issue

 
Himal Chuli
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Hi,
could you please give an explanation for answers to quesiont #13 and #18 in
http://www.coderanch.com/t/146730/po/certification/IBM-Mock-Exam-Information-Modeling
is there any site that i can look at to understand these issues?
thanks.
himal
 
Kevin Thompson
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Question 13 & Question 18 are bogus questions.
There is no technical knowledge that you need to obtain. The only thing to understand is that these questions are flawed questions with flawed answers. The only reason both questions have an answer of a) and d) is because IBM's answer key says so.
We can only hope that the real, actual test does not have these type of bogus questions.
Kevin Thompson
 
Svetlana Petrova
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Kevin,
I agree with you about #13.
But #18 actually makes sense and answers sound reasonable. I posted once this message suggesting to take a look at
http://www.w3.org/TR/xmlschema-0/
"Chapter5. Advanced Concepts III: The Quarterly Report"
Search for "report.xsd".
It's a good example and it helped me to understand that the answers are:
A) Use ID and IDREF attributes to represent unidirectional relationships;
(you don't make bi-directional relationship, it's a unidirectional FK->PK);
D) Copy the data in a relationship into the element for the row containing the primary key.
Example below is from report.xsd sample. This is, I guess, what they call "copy data into element".
<unique name="dummy1">
<selector xpath="r:regions/r:zip"/>
<field xpath="@code"/>
</unique>
<key name="pNumKey">
<selector xpath="r arts/r art"/>
<field xpath="@number"/>
</key>
You get all the primary keys into element, because than you'll be refering to them from other elements, which are assumed to contain foreign keys.
It's how I was thinking about this problem. Correct me, if I'm wrong. (But the answers in IBM test are still A and D )
Take care,
Svetlana.
 
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