Rosalind wants to add attribute declarations to her DTD, and she turns to you for information about the possible attribute types.
-Rosalind wants to declare a "coursenum" attribute, the values of which will be unique within the document.Which attribute type should she use?
A) CDATA
B) UNIQUE
C) ID
D) IDREF

Question

Quizplus · Accepted Answer

The "ID" attribute type is used to specify that the attribute value must be unique within the document. This is a good choice for Rosalind's "coursenum" attribute requirement. The other attribute types listed are not suitable for enforcing uniqueness. CDATA allows any string value, UNIQUE is not a valid attribute type, and IDREF allows the attribute value to match another ID type attribute value, but does not enforce uniqueness.

Rosalind Wants to Add Attribute Declarations to Her DTD, and She