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XML certification quizzer: a review of some key concepts. (Certification).

Article Excerpt
Last month's column introduced you to the exam objectives for IBM Test 141 on XML and Related Technologies. This installment will present five more questions from the five different exam objectives. It can be used as a learning tool for people who are new to XML If you are preparing for the exam, the article will help you review key concepts.

Question I (XML Processing)

Which of the following XSLT elements sets the value of a variable x to the literal string value "a"?

A.

B.

C.

D.

Select one answer.

Explanation: Choice C is the correct answer. There are three methods for specifying the value of a variable:

1. Use an empty xsl:variable element with a select attribute. The value of the variable is the object that results from evaluating the expression in the select attribute.

2. Use a nonempty xsl:variable element with no select attribute. In this case, the xsl:variable has one or more child nodes, which form a template. The template is instantiated to produce a result tree fragment, which is the value of the variable. The root node of the result tree fragment contains a sequence of child nodes generated by instantiating the template.

3. Set the value of the variable to an empty string by using an empty xsl:variable element with no select attribute.

In order to assign a literal string value to a variable, the value must be delimited with quotes....

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