public interface NamedNodeMap
NamedNodeMap interface are used to 
 represent collections of nodes that can be accessed by name. Note that 
 NamedNodeMap does not inherit from NodeList; 
 NamedNodeMaps are not maintained in any particular order. 
 Objects contained in an object implementing NamedNodeMap may 
 also be accessed by an ordinal index, but this is simply to allow 
 convenient enumeration of the contents of a NamedNodeMap, 
 and does not imply that the DOM specifies an order to these Nodes. 
 NamedNodeMap objects in the DOM are live.
 
See also the Document Object Model (DOM) Level 3 Core Specification.
| Modifier and Type | Method and Description | 
|---|---|
| int | getLength()The number of nodes in this map. | 
| Node | getNamedItem(java.lang.String name)Retrieves a node specified by name. | 
| Node | getNamedItemNS(java.lang.String namespaceURI,
              java.lang.String localName)Retrieves a node specified by local name and namespace URI. | 
| Node | item(int index)Returns the  indexth item in the map. | 
| Node | removeNamedItem(java.lang.String name)Removes a node specified by name. | 
| Node | removeNamedItemNS(java.lang.String namespaceURI,
                 java.lang.String localName)Removes a node specified by local name and namespace URI. | 
| Node | setNamedItem(Node arg)Adds a node using its  nodeNameattribute. | 
| Node | setNamedItemNS(Node arg)Adds a node using its  namespaceURIandlocalName. | 
Node getNamedItem(java.lang.String name)
name - The nodeName of a node to retrieve.Node (of any type) with the specified 
   nodeName, or null if it does not identify 
   any node in this map.Node setNamedItem(Node arg) throws DOMException
nodeName attribute. If a node with 
 that name is already present in this map, it is replaced by the new 
 one. Replacing a node by itself has no effect.
 nodeName attribute is used to derive the name 
 which the node must be stored under, multiple nodes of certain types 
 (those that have a "special" string value) cannot be stored as the 
 names would clash. This is seen as preferable to allowing nodes to be 
 aliased.arg - A node to store in this map. The node will later be 
   accessible using the value of its nodeName attribute.Node replaces an existing node the 
   replaced Node is returned, otherwise null 
   is returned.DOMException - WRONG_DOCUMENT_ERR: Raised if arg was created from a 
   different document than the one that created this map.
   arg is an 
   Attr that is already an attribute of another 
   Element object. The DOM user must explicitly clone 
   Attr nodes to re-use them in other elements.
   Node removeNamedItem(java.lang.String name) throws DOMException
name - The nodeName of the node to remove.DOMException - NOT_FOUND_ERR: Raised if there is no node named name in 
   this map.
   Node item(int index)
indexth item in the map. If index 
 is greater than or equal to the number of nodes in this map, this 
 returns null.index - Index into this map.indexth position in the map, or 
   null if that is not a valid index.int getLength()
0 to length-1 inclusive.Node getNamedItemNS(java.lang.String namespaceURI, java.lang.String localName) throws DOMException
namespaceURI - The namespace URI of the node to retrieve.localName - The local name of the node to retrieve.Node (of any type) with the specified local 
   name and namespace URI, or null if they do not 
   identify any node in this map.DOMException - NOT_SUPPORTED_ERR: May be raised if the implementation does not 
   support the feature "XML" and the language exposed through the 
   Document does not support XML Namespaces (such as [HTML 4.01]).Node setNamedItemNS(Node arg) throws DOMException
namespaceURI and 
 localName. If a node with that namespace URI and that 
 local name is already present in this map, it is replaced by the new 
 one. Replacing a node by itself has no effect.
 arg - A node to store in this map. The node will later be 
   accessible using the value of its namespaceURI and 
   localName attributes.Node replaces an existing node the 
   replaced Node is returned, otherwise null 
   is returned.DOMException - WRONG_DOCUMENT_ERR: Raised if arg was created from a 
   different document than the one that created this map.
   arg is an 
   Attr that is already an attribute of another 
   Element object. The DOM user must explicitly clone 
   Attr nodes to re-use them in other elements.
   Node removeNamedItemNS(java.lang.String namespaceURI, java.lang.String localName) throws DOMException
Node interface. If so, an attribute 
 immediately appears containing the default value as well as the 
 corresponding namespace URI, local name, and prefix when applicable.
 namespaceURI - The namespace URI of the node to remove.localName - The local name of the node to remove.DOMException - NOT_FOUND_ERR: Raised if there is no node with the specified 
   namespaceURI and localName in this map.
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