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The DOMNameSpaceNode class

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The qualified name of this node.

class DOMNameSpaceNode { }

nodeName: The qualified name of this node.
nodeValue: The namespace URI declared by this node, or null if the empty namespace.
nodeType: The type of the node. In this case it returns XML_NAMESPACE_DECL_NODE.
prefix: The namespace prefix declared by this node.
localName: The local part of the qualified name of this node.
namespaceURI: The namespace URI declared by this node, or null if it is unspecified.
isConnected: Whether the node is connected to a document.
ownerDocument: The DOMDocument object associated with this node, or null if this node is a DOMDocument
parentNode: The parent of this node. If there is no such node, this returns null.
parentElement: The parent element of this node. If there is no such element, this returns null.

Version	Description
8.3.0	Properties `DOMNameSpaceNode::$parentElement`, and `DOMNameSpaceNode::$isConnected` have been added.

Domnamespacenode

In this section

Forbids serialization unless serialization methods are implemented in a subclass

Forbids unserialization unless unserialization methods are implemented in a subclass

Source: reference/dom/domnamespacenode.xml · from the official PHP manual (php/doc-en)