Well-Formed XML

Code

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<!-- Well-formed XML must:
     1. Have a single root element
     2. Nest tags properly (close in reverse order)
     3. Quote all attribute values
     4. Use unique attribute names per element
     5. Escape & < > as &amp; &lt; &gt; -->
<rss version="2.0">
  <channel>
    <title>Feed</title>
    <link>https://example.com</link>
    <description>A valid, well-formed XML document</description>
  </channel>
</rss>

Explanation

An XML document is well-formed when it follows the syntactic rules: one root, properly nested tags, quoted attributes, and escaped special characters. Well-formedness is mandatory for any parser to read the document, while validity additionally checks a DTD or schema. The XML declaration is optional but recommended at the top.

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