XML·XML from well-formed documents to XSLT

XML basics

Elements, attributes, the prolog and the document tree.

Beginner 12 min read Lesson 1 of 300 Challenge included

What you will be able to do

One root element per document.
Elements nest; tags must close.
Use attributes for metadata, not repeated data.
The prolog declares the XML version.

In plain English

XML is a markup language for structured data. A document has one root element and a tree of nested elements. Attributes describe elements but should not replace child data when the value can repeat.

course.xmlHTML

<?xml version="1.0" encoding="UTF-8"?>
<course id="css">
  <title>CSS Grid</title>
  <lessons>
    <lesson minutes="18">Grid basics</lesson>
  </lessons>
</course>

Your turn

Write a root element

Easy

Write the opening and closing tags for a course root with one title child.

HTML · starter

<course>

Check your understanding before moving on.

Knowledge checkQuestion 1

How many root elements can an XML document have?

Select an answer to continue

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Lesson 1 of 300 · 0% of course