What is XML?

XML Interview Questions and Answers

1. What is XML?

XML is the Extensible Markup Language. It improves the functionality of the Web by letting you identify your information in a more accurate, flexible, and adaptable way.
It is extensible because it is not a fixed format like HTML (which is a single, predefined markup language). Instead, XML is actually a metalanguage—a language for describing other languages—which lets you design your own markup languages for limitless different types of documents. XML can do this because it's written in SGML, the international standard metalanguage for text document markup (ISO 8879).

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Other Interview Questions

• How do I declare an XML namespace in an XML document?
• Can I use qualified names in DTDs?
• What characters are allowed in an XML namespace prefix?
• Who is responsible for XML?
• How can I validate an XML document that uses XML namespaces?
• Can I still use server-side inclusions?
• What are the valid values for xlink:actuate and xlink:show?
• How can I declare XML namespaces so that all elements and attributes are in their scope?
• How can I allow the prefixes in my document to be different from the prefixes in my DTD?
• How can I make my existing HTML files work in XML?
• More...