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Please explain the mock DTD question

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3. Which of the following code is valid?

a)<!DOCTYPE test [ <!ELEMENT test (#PCDATA)>]>
b)<!DOCTYPE test [ <!ELEMENT test.dtd (elm1|elm2|#PCDATA) >]>
c)<!DOCTYPE test [ <!ELEMENT test.dtd (#PCDATA|elm1|elm2)* >]>
d)<!DOCTYPE test [ <!ELEMENT test test (#PCDATA)>]>
e)<!DOCTYPE test [ <!ELEMENT test "test" (#PCDATA)>]>

Answer : a c

I think only a is correct.
c is looking to be an incomplete DTD defintion.

Which of the following code is valid
a) <!ENTITY test "(#PCDATA)" >
<!ELEMENT elm1 &test;>
b) <!ENTITY lt "*(&5;#">
c) <!ENTITY test elm "elm1">
d) <!ENTITY test SYSTEM "elm">
e) <!ENTITY %test "(#PCDATA)">
<!ELEMENT elm1 %test;>

Answer : d e

For answer e there should be space between % and test only then the code would be valid
So I think the answer is a and d.
Why isnt a the answer also ..?
Some one please clarify the answers .


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For the first question:
a is correct, but I think that there is an error that the closing bracket "]" has to be after the definition of the second element which is "elm2"

For the second question:
a is not correct, because inside DTD only parameter entities (which uses %) are permitted, but at the question, a general entity (which uses &) is used, which can be only used inside XML
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