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In the Document Object Model (DOM), the primary types of nodes include element nodes, text nodes, and document nodes. Each of these plays a specific role in representing the structure and content of a document.

Element nodes represent the various HTML tags and are the building blocks of the DOM tree. They can contain attributes, child nodes, and text, thus facilitating the representation of the document's structure.

Text nodes are used to hold the text content within elements. This means that any actual text you see within an HTML tag is contained in a text node, making it essential for rendering the document's view.

Document nodes serve as the root of the DOM structure. They represent the entire document, including its type (HTML, XML, etc.), and provide methods to access and manipulate other nodes within the tree.

On the other hand, there is no such thing as a "function node" in the context of the DOM. While functions can be used in JavaScript to manipulate the document and interact with nodes, they do not have a dedicated representation in the DOM structure itself. Thus, identifying function nodes as a type of node in the DOM is incorrect.