XML quiz

Test your XML knowledge with a free interactive quiz — 20 questions with answers and explanations. No signup needed to play.

Which of these is a valid, well-formed XML element?

1. Which of these is a valid, well-formed XML element?
2. What does mixed content mean in an XML document?
3. Why is XML case-sensitive?
4. What is the practical implication of XML being a text-based format for interoperability between systems built in different programming languages?
5. What is a CDATA section used for in XML?
6. What does XPath allow you to do with an XML document?
7. Why must the character < be escaped (as &lt;) when it appears as literal text content inside an XML element (not as a tag)?
8. What is a DTD (Document Type Definition) used for?
9. What is the purpose of XSLT (Extensible Stylesheet Language Transformations)?
10. Why does XML remain heavily used in certain enterprise and document-oriented contexts despite JSON's popularity elsewhere?
11. Which of these correctly distinguishes an XML "comment" from actual document content?
12. What is the difference between an XML element and an XML attribute?

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