PHP Manual
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(no version information, might be only in CVS)
This method adds a namespace declaration to a node.
Note: This method is not part of the DOM specification.
The namespace URI of the node.
The namespace prefix of the node.
Returns TRUE on success or FALSE on failure.
You can set the namespace URI and prefix of a DOMElement or a DOMAttr at creation time by using DOMDocument->createElementNS() or DOMDocument->createAttributeNS().
Note: Remember the an attribute does not inherit its namespace from the element it is attached to.