What is XML DOM?

Estimated study time: 12 minutes.

The XML DOM (Document Object Model) is a standard, language-independent way of representing an XML document as a tree of objects that a program can navigate, read, and modify.

How It Relates to Parsing

When a DOM parser reads an XML file, it builds this in-memory tree representation — every element, attribute, and piece of text becomes a node object with defined properties and methods.

A Simple Example

<course>
  <title>Data Analytics</title>
</course>

In the DOM, this becomes: a course element node, containing a title element node, which itself contains a text node with the value "Data Analytics".

Why the DOM Matters

• It's a consistent, standardized model — the same concepts apply whether you're using JavaScript, Java, Python, or C#.
• It supports both reading and writing — you can add, remove, or modify nodes and then serialize the tree back to XML.
• It underlies many higher-level tools, including how browsers represent HTML documents.

DOM vs Streaming Parsers

Unlike SAX or StAX, which stream through a document once, the DOM loads everything into memory as a navigable, editable tree — trading memory usage for flexibility.