XML·XML from well-formed documents to XSLT

Namespaces

Use xmlns prefixes to combine vocabularies without collisions.

Beginner 12 min read Lesson 3 of 300 Challenge included

What you will be able to do

Declare xmlns on the root or the scope where it is used.
Use xmlns:prefix for prefixed names.
The URI is the identity, not the prefix.
Attributes without a prefix are in no namespace.

In plain English

Namespaces qualify element and attribute names. A prefix is only a shorthand for a URI. Different prefixes can point to the same namespace, so compare the URI, not the prefix.

namespaces.xmlHTML

<feed xmlns="http://www.w3.org/2005/Atom"
      xmlns:x="https://example.com/x">
  <title>EduByte</title>
  <x:meta x:version="1" />
</feed>

Your turn

Declare a namespace

Easy

Add a default Atom namespace to a feed element.

HTML · starter

<feed>

Check your understanding before moving on.

Knowledge checkQuestion 1

What identifies a namespace?

Select an answer to continue

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Lesson 3 of 300 · 0% of course