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## org.w3c.dom
Interface NamedNodeMap

public interface NamedNodeMap

Objects implementing the `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 2 Core Specification.

Method Summary
`int` | `getLength()` The number of nodes in this map.
`Node` | `getNamedItem(String name)` Retrieves a node specified by name.
`Node` | `getNamedItemNS(String namespaceURI, String localName)` Retrieves a node specified by local name and namespace URI.
`Node` | `item(int index)` Returns the `index`th item in the map.
`Node` | `removeNamedItem(String name)` Removes a node specified by name.
`Node` | `removeNamedItemNS(String namespaceURI, String localName)` Removes a node specified by local name and namespace URI.
`Node` | `setNamedItem(Node arg)` Adds a node using its `nodeName` attribute.
`Node` | `setNamedItemNS(Node arg)` Adds a node using its `namespaceURI` and `localName`.

Method Detail

### getNamedItem

    public Node getNamedItem(String name)

  Retrieves a node specified by name.

  Parameters:
    `name` - The `nodeName` of a node to retrieve.
  Returns:
    A `Node` (of any type) with the specified `nodeName`, or `null` if it does not identify any node in this map.

### setNamedItem

    public Node setNamedItem(Node arg)
                      throws DOMException

  Adds a node using its `nodeName` attribute. If a node with that name is already present in this map, it is replaced by the new one.
  As the `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.

  Parameters:
    `arg` - A node to store in this map. The node will later be accessible using the value of its `nodeName` attribute.
  Returns:
    If the new `Node` replaces an existing node the replaced `Node` is returned, otherwise `null` is returned.
  Throws:
    `DOMException` - WRONG_DOCUMENT_ERR: Raised if `arg` was created from a different document than the one that created this map.
    NO_MODIFICATION_ALLOWED_ERR: Raised if this map is readonly.
    INUSE_ATTRIBUTE_ERR: Raised if `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.
    HIERARCHY_REQUEST_ERR: Raised if an attempt is made to add a node doesn't belong in this NamedNodeMap. Examples would include trying to insert something other than an Attr node into an Element's map of attributes, or a non-Entity node into the DocumentType's map of Entities.

### removeNamedItem

    public Node removeNamedItem(String name)
                         throws DOMException

  Removes a node specified by name. When this map contains the attributes attached to an element, if the removed attribute is known to have a default value, an attribute immediately appears containing the default value as well as the corresponding namespace URI, local name, and prefix when applicable.

  Parameters:
    `name` - The `nodeName` of the node to remove.
  Returns:
    The node removed from this map if a node with such a name exists.
  Throws:
    `DOMException` - NOT_FOUND_ERR: Raised if there is no node named `name` in this map.
    NO_MODIFICATION_ALLOWED_ERR: Raised if this map is readonly.

### item

    public Node item(int index)

  Returns the `index`th item in the map. If `index` is greater than or equal to the number of nodes in this map, this returns `null`.

  Parameters:
    `index` - Index into this map.
  Returns:
    The node at the `index`th position in the map, or `null` if that is not a valid index.

### getLength

    public int getLength()

  The number of nodes in this map. The range of valid child node indices is `0` to `length-1` inclusive.

### getNamedItemNS

    public Node getNamedItemNS(String namespaceURI,
                               String localName)

  Retrieves a node specified by local name and namespace URI.
  Documents which do not support the "XML" feature will permit only the DOM Level 1 calls for creating/setting elements and attributes. Hence, if you specify a non-null namespace URI, these DOMs will never find a matching node.

  Parameters:
    `namespaceURI` - The namespace URI of the node to retrieve.
    `localName` - The local name of the node to retrieve.
  Returns:
    A `Node` (of any type) with the specified local name and namespace URI, or `null` if they do not identify any node in this map.
  Since:
    DOM Level 2

### setNamedItemNS

    public Node setNamedItemNS(Node arg)
                        throws DOMException

  Adds a node using its `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.

  Parameters:
    `arg` - A node to store in this map. The node will later be accessible using the value of its `namespaceURI` and `localName` attributes.
  Returns:
    If the new `Node` replaces an existing node the replaced `Node` is returned, otherwise `null` is returned.
  Throws:
    `DOMException` - WRONG_DOCUMENT_ERR: Raised if `arg` was created from a different document than the one that created this map.
    NO_MODIFICATION_ALLOWED_ERR: Raised if this map is readonly.
    INUSE_ATTRIBUTE_ERR: Raised if `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.
    HIERARCHY_REQUEST_ERR: Raised if an attempt is made to add a node doesn't belong in this NamedNodeMap. Examples would include trying to insert something other than an Attr node into an Element's map of attributes, or a non-Entity node into the DocumentType's map of Entities.
    NOT_SUPPORTED_ERR: Always thrown if the current document does not support the `"XML"` feature, since namespaces were defined by XML.
  Since:
    DOM Level 2

### removeNamedItemNS

    public Node removeNamedItemNS(String namespaceURI,
                                  String localName)
                           throws DOMException

  Removes a node specified by local name and namespace URI. A removed attribute may be known to have a default value when this map contains the attributes attached to an element, as returned by the attributes attribute of the `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.
  Documents which do not support the "XML" feature will permit only the DOM Level 1 calls for creating/setting elements and attributes. Hence, if you specify a non-null namespace URI, these DOMs will never find a matching node.

  Parameters:
    `namespaceURI` - The namespace URI of the node to remove.
    `localName` - The local name of the node to remove.
  Returns:
    The node removed from this map if a node with such a local name and namespace URI exists.
  Throws:
    `DOMException` - NOT_FOUND_ERR: Raised if there is no node with the specified `namespaceURI` and `localName` in this map.
    NO_MODIFICATION_ALLOWED_ERR: Raised if this map is readonly.
  Since:
    DOM Level 2

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