/*
* Copyright (c) 2000 World Wide Web Consortium,
* (Massachusetts Institute of Technology, Institut National de
* Recherche en Informatique et en Automatique, Keio University). All
* Rights Reserved. This program is distributed under the W3C's Software
* Intellectual Property License. This program is distributed in the
* hope that it will be useful, but WITHOUT ANY WARRANTY; without even
* the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
* PURPOSE.
* See W3C License http://www.w3.org/Consortium/Legal/ for more details.
*/
package org.w3c.dom;
/**
* The <code>Element</code> interface represents an element in an HTML or XML
* document. Elements may have attributes associated with them; since the
* <code>Element</code> interface inherits from <code>Node</code>, the
* generic <code>Node</code> interface attribute <code>attributes</code> may
* be used to retrieve the set of all attributes for an element. There are
* methods on the <code>Element</code> interface to retrieve either an
* <code>Attr</code> object by name or an attribute value by name. In XML,
* where an attribute value may contain entity references, an
* <code>Attr</code> object should be retrieved to examine the possibly
* fairly complex sub-tree representing the attribute value. On the other
* hand, in HTML, where all attributes have simple string values, methods to
* directly access an attribute value can safely be used as a convenience.In
* DOM Level 2, the method <code>normalize</code> is inherited from the
* <code>Node</code> interface where it was moved.
* <p>See also the <a href='http://www.w3.org/TR/2000/REC-DOM-Level-2-Core-20001113'>Document Object Model (DOM) Level 2 Core Specification</a>.
*/
public interface Element extends Node {
/**
* The name of the element. For example, in:
* <pre> <elementExample
* id="demo"> ... </elementExample> , </pre>
* <code>tagName</code> has
* the value <code>"elementExample"</code>. Note that this is
* case-preserving in XML, as are all of the operations of the DOM. The
* HTML DOM returns the <code>tagName</code> of an HTML element in the
* canonical uppercase form, regardless of the case in the source HTML
* document.
*/
public String getTagName();
/**
* Retrieves an attribute value by name.
* @param name The 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.
*/
public String getAttribute(String name);
/**
* Adds a new attribute. If an attribute with that name is already present
* in the element, its value is changed to be that of the value
* 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>setAttributeNode</code> to assign
* it as the value of an attribute.
* <br>To set an attribute with a qualified name and namespace URI, use
* the <code>setAttributeNS</code> method.
* @param name The name of the attribute to create or alter.
* @param value Value to set in string form.
* @exception org.w3c.dom.DOMException
* INVALID_CHARACTER_ERR: Raised if the specified name contains an
* illegal character.
* <br>NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.
*/
public void setAttribute(String name,
String value)
throws DOMException;
/**
* Removes an attribute by name. 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.
* <br>To remove an attribute by local name and namespace URI, use the
* <code>removeAttributeNS</code> method.
* @param name The name of the attribute to remove.
* @exception org.w3c.dom.DOMException
* NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.
*/
public void removeAttribute(String name)
throws DOMException;
/**
* Retrieves an attribute node by name.
* <br>To retrieve an attribute node by qualified name and namespace URI,
* use the <code>getAttributeNodeNS</code> method.
* @param name The name (<code>nodeName</code>) of the attribute to
* retrieve.
* @return The <code>Attr</code> node with the specified name (
* <code>nodeName</code>) or <code>null</code> if there is no such
* attribute.
*/
public Attr getAttributeNode(String name);
/**
* Adds a new attribute node. If an attribute with that name (
* <code>nodeName</code>) is already present in the element, it is
* replaced by the new one.
* <br>To add a new attribute node with a qualified name and namespace
* URI, use the <code>setAttributeNodeNS</code> method.
* @param newAttr The <code>Attr</code> node to add to the attribute list.
* @return If the <code>newAttr</code> attribute replaces an existing
* attribute, the replaced <code>Attr</code> node is returned,
* otherwise <code>null</code> is returned.
* @exception org.w3c.dom.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.
*/
public Attr setAttributeNode(Attr newAttr)
throws DOMException;
/**
* Removes the specified attribute node. If the removed <code>Attr</code>
* 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, when applicable.
* @param oldAttr The <code>Attr</code> node to remove from the attribute
* list.
* @return The <code>Attr</code> node that was removed.
* @exception org.w3c.dom.DOMException
* NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.
* <br>NOT_FOUND_ERR: Raised if <code>oldAttr</code> is not an attribute
* of the element.
*/
public Attr removeAttributeNode(Attr oldAttr)
throws DOMException;
/**
* Returns a <code>NodeList</code> of all descendant <code>Elements</code>
* with a given tag name, in the order in which they are encountered in
* a preorder traversal of this <code>Element</code> tree.
* @param name The name of the tag to match on. The special value "*"
* matches all tags.
* @return A list of matching <code>Element</code> nodes.
*/
public NodeList getElementsByTagName(String name);
/**
* Retrieves an attribute value by local name and namespace URI.
* <br>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.
* @param namespaceURI The namespace URI of the attribute to retrieve.
* @param localName The 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.
* @param namespaceURI The namespace URI of the attribute to create or
* alter.
* @param qualifiedName The qualified name of the attribute to create or
* alter.
* @param value The value to set in string form.
* @exception org.w3c.dom.DOMException
* INVALID_CHARACTER_ERR: Raised if the specified qualified name
* contains an illegal character, per the XML 1.0 specification .
* <br>NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.
* <br>NAMESPACE_ERR: Raised if the <code>qualifiedName</code> is
* malformed per the Namespaces in XML specification, 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>, or its prefix, is "xmlns" and the
* <code>namespaceURI</code> is different from "
* http://www.w3.org/2000/xmlns/".
* <br>NOT_SUPPORTED_ERR: Always thrown if the current document does not
* support the <code>"XML"</code> feature, since namespaces were
* defined by XML.
* @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>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.
* @param namespaceURI The namespace URI of the attribute to remove.
* @param localName The local name of the attribute to remove.
* @exception org.w3c.dom.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.
* <br>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.
* @param namespaceURI The namespace URI of the attribute to retrieve.
* @param localName The 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.
* @param newAttr The <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 org.w3c.dom.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.
* <br>NOT_SUPPORTED_ERR: Always thrown if the current document does not
* support the <code>"XML"</code> feature, since namespaces were
* defined by XML.
* @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>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.
* @param namespaceURI The namespace URI of the elements to match on. The
* special value "*" matches all namespaces.
* @param localName The 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 name The 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.
* <br>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.
* @param namespaceURI The namespace URI of the attribute to look for.
* @param localName The 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);
}