element.java

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    /**
     * Retrieves an attribute value by local name and namespace URI. HTML-only 
     * DOM implementations do not need to implement this method.
     * @param namespaceURIThe namespace URI of the attribute to retrieve.
     * @param localNameThe local name of the attribute to retrieve.
     * @return The <code>Attr</code> value as a string, or the empty string 
     *   if that attribute does not have a specified or default value.
     * @since DOM Level 2
     */
    public String getAttributeNS(String namespaceURI, 
                                 String localName);

    /**
     * Adds a new attribute. If an attribute with the same local name and 
     * namespace URI is already present on the element, its prefix is 
     * changed to be the prefix part of the <code>qualifiedName</code>, and 
     * its value is changed to be the <code>value</code> parameter. This 
     * value is a simple string; it is not parsed as it is being set. So any 
     * markup (such as syntax to be recognized as an entity reference) is 
     * treated as literal text, and needs to be appropriately escaped by the 
     * implementation when it is written out. In order to assign an 
     * attribute value that contains entity references, the user must create 
     * an <code>Attr</code> node plus any <code>Text</code> and 
     * <code>EntityReference</code> nodes, build the appropriate subtree, 
     * and use <code>setAttributeNodeNS</code> or 
     * <code>setAttributeNode</code> to assign it as the value of an 
     * attribute.
     * <br>HTML-only DOM implementations do not need to implement this method.
     * @param namespaceURIThe namespace URI of the attribute to create or 
     *   alter.
     * @param qualifiedNameThe qualified name of the attribute to create or 
     *   alter.
     * @param valueThe value to set in string form.
     * @exception DOMException
     *   INVALID_CHARACTER_ERR: Raised if the specified qualified name 
     *   contains an illegal character.
     *   <br>NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.
     *   <br>NAMESPACE_ERR: Raised if the <code>qualifiedName</code> is 
     *   malformed, if the <code>qualifiedName</code> has a prefix and the 
     *   <code>namespaceURI</code> is <code>null</code>, if the 
     *   <code>qualifiedName</code> has a prefix that is "xml" and the 
     *   <code>namespaceURI</code> is different from "
     *   http://www.w3.org/XML/1998/namespace", or if the 
     *   <code>qualifiedName</code> is "xmlns" and the 
     *   <code>namespaceURI</code> is different from "
     *   http://www.w3.org/2000/xmlns/".
     * @since DOM Level 2
     */
    public void setAttributeNS(String namespaceURI, 
                               String qualifiedName, 
                               String value)
                               throws DOMException;

    /**
     * Removes an attribute by local name and namespace URI. If the removed 
     * attribute has a default value it is immediately replaced. The 
     * replacing attribute has the same namespace URI and local name, as 
     * well as the original prefix.
     * <br>HTML-only DOM implementations do not need to implement this method.
     * @param namespaceURIThe namespace URI of the attribute to remove.
     * @param localNameThe local name of the attribute to remove.
     * @exception DOMException
     *   NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.
     * @since DOM Level 2
     */
    public void removeAttributeNS(String namespaceURI, 
                                  String localName)
                                  throws DOMException;

    /**
     * Retrieves an <code>Attr</code> node by local name and namespace URI. 
     * HTML-only DOM implementations do not need to implement this method.
     * @param namespaceURIThe namespace URI of the attribute to retrieve.
     * @param localNameThe local name of the attribute to retrieve.
     * @return The <code>Attr</code> node with the specified attribute local 
     *   name and namespace URI or <code>null</code> if there is no such 
     *   attribute.
     * @since DOM Level 2
     */
    public Attr getAttributeNodeNS(String namespaceURI, 
                                   String localName);

    /**
     * Adds a new attribute. If an attribute with that local name and that 
     * namespace URI is already present in the element, it is replaced by 
     * the new one.
     * <br>HTML-only DOM implementations do not need to implement this method.
     * @param newAttrThe <code>Attr</code> node to add to the attribute list.
     * @return If the <code>newAttr</code> attribute replaces an existing 
     *   attribute with the same local name and namespace URI, the replaced 
     *   <code>Attr</code> node is returned, otherwise <code>null</code> is 
     *   returned.
     * @exception DOMException
     *   WRONG_DOCUMENT_ERR: Raised if <code>newAttr</code> was created from a 
     *   different document than the one that created the element.
     *   <br>NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.
     *   <br>INUSE_ATTRIBUTE_ERR: Raised if <code>newAttr</code> is already an 
     *   attribute of another <code>Element</code> object. The DOM user must 
     *   explicitly clone <code>Attr</code> nodes to re-use them in other 
     *   elements.
     * @since DOM Level 2
     */
    public Attr setAttributeNodeNS(Attr newAttr)
                                   throws DOMException;

    /**
     * Returns a <code>NodeList</code> of all the descendant 
     * <code>Elements</code> with a given local name and namespace URI in 
     * the order in which they are encountered in a preorder traversal of 
     * this <code>Element</code> tree.
     * <br>HTML-only DOM implementations do not need to implement this method.
     * @param namespaceURIThe namespace URI of the elements to match on. The 
     *   special value "*" matches all namespaces.
     * @param localNameThe local name of the elements to match on. The 
     *   special value "*" matches all local names.
     * @return A new <code>NodeList</code> object containing all the matched 
     *   <code>Elements</code>.
     * @since DOM Level 2
     */
    public NodeList getElementsByTagNameNS(String namespaceURI, 
                                           String localName);

    /**
     * Returns <code>true</code> when an attribute with a given name is 
     * specified on this element or has a default value, <code>false</code> 
     * otherwise.
     * @param nameThe name of the attribute to look for.
     * @return <code>true</code> if an attribute with the given name is 
     *   specified on this element or has a default value, <code>false</code>
     *    otherwise.
     * @since DOM Level 2
     */
    public boolean hasAttribute(String name);

    /**
     * Returns <code>true</code> when an attribute with a given local name and 
     * namespace URI is specified on this element or has a default value, 
     * <code>false</code> otherwise. HTML-only DOM implementations do not 
     * need to implement this method.
     * @param namespaceURIThe namespace URI of the attribute to look for.
     * @param localNameThe local name of the attribute to look for.
     * @return <code>true</code> if an attribute with the given local name 
     *   and namespace URI is specified or has a default value on this 
     *   element, <code>false</code> otherwise.
     * @since DOM Level 2
     */
    public boolean hasAttributeNS(String namespaceURI, 
                                  String localName);

}