WebCore/src/kdelibs/khtml/dom/dom_element.h - WebKit - Git at Google

 /*
  * This file is part of the DOM implementation for KDE.
  *
  * (C) 1999 Lars Knoll (knoll@kde.org)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library 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 the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  * Boston, MA 02111-1307, USA.
  *
  * This file includes excerpts from the Document Object Model (DOM)
  * Level 1 Specification (Recommendation)
  * http://www.w3.org/TR/REC-DOM-Level-1/
  * Copyright © World Wide Web Consortium , (Massachusetts Institute of
  * Technology , Institut National de Recherche en Informatique et en
  * Automatique , Keio University ). All Rights Reserved.
  *
  */
 #ifndef _DOM_ELEMENT_h_
 #define _DOM_ELEMENT_h_

 #include <dom/dom_node.h>
 #include <dom/css_value.h>

 namespace DOM {

 class DOMString;
 class AttrImpl;
 class Element;
 class ElementImpl;
 class NamedAttrMapImpl;
 class DocumentImpl;

 /**
  * The <code> Attr </code> interface represents an attribute in an
  * <code> Element </code> object. Typically the allowable values for
  * the attribute are defined in a document type definition.
  *
  *  <code> Attr </code> objects inherit the <code> Node </code>
  * interface, but since they are not actually child nodes of the
  * element they describe, the DOM does not consider them part of the
  * document tree. Thus, the <code> Node </code> attributes <code>
  * parentNode </code> , <code> previousSibling </code> , and <code>
  * nextSibling </code> have a null value for <code> Attr </code>
  * objects. The DOM takes the view that attributes are properties of
  * elements rather than having a separate identity from the elements
  * they are associated with; this should make it more efficient to
  * implement such features as default attributes associated with all
  * elements of a given type. Furthermore, <code> Attr </code> nodes
  * may not be immediate children of a <code> DocumentFragment </code>
  * . However, they can be associated with <code> Element </code> nodes
  * contained within a <code> DocumentFragment </code> . In short,
  * users and implementors of the DOM need to be aware that <code> Attr
  * </code> nodes have some things in common with other objects
  * inheriting the <code> Node </code> interface, but they also are
  * quite distinct.
  *
  *  The attribute's effective value is determined as follows: if this
  * attribute has been explicitly assigned any value, that value is the
  * attribute's effective value; otherwise, if there is a declaration
  * for this attribute, and that declaration includes a default value,
  * then that default value is the attribute's effective value;
  * otherwise, the attribute does not exist on this element in the
  * structure model until it has been explicitly added. Note that the
  * <code> nodeValue </code> attribute on the <code> Attr </code>
  * instance can also be used to retrieve the string version of the
  * attribute's value(s).
  *
  *  In XML, where the value of an attribute can contain entity
  * references, the child nodes of the <code> Attr </code> node provide
  * a representation in which entity references are not expanded. These
  * child nodes may be either <code> Text </code> or <code>
  * EntityReference </code> nodes. Because the attribute type may be
  * unknown, there are no tokenized attribute values.
  *
  */
 class Attr : public Node
 {
     friend class Element;
     friend class Document;
     friend class DocumentImpl;
     friend class HTMLDocument;
     friend class ElementImpl;
     friend class NamedAttrMapImpl;

 public:
     Attr();
     Attr(const Node &other) : Node()
         {(*this)=other;}
     Attr(const Attr &other);

     Attr & operator = (const Node &other);
     Attr & operator = (const Attr &other);

     ~Attr();

     /**
      * Returns the name of this attribute.
      *
      */
     DOMString name() const;

     /**
      * If this attribute was explicitly given a value in the original
      * document, this is <code> true </code> ; otherwise, it is <code>
      * false </code> . Note that the implementation is in charge of
      * this attribute, not the user. If the user changes the value of
      * the attribute (even if it ends up having the same value as the
      * default value) then the <code> specified </code> flag is
      * automatically flipped to <code> true </code> . To re-specify
      * the attribute as the default value from the DTD, the user must
      * delete the attribute. The implementation will then make a new
      * attribute available with <code> specified </code> set to <code>
      * false </code> and the default value (if one exists).
      *
      *  In summary: <ulist> <item> If the attribute has an assigned
      * value in the document then <code> specified </code> is <code>
      * true </code> , and the value is the assigned value.
      *
      *  </item> <item> If the attribute has no assigned value in the
      * document and has a default value in the DTD, then <code>
      * specified </code> is <code> false </code> , and the value is
      * the default value in the DTD.
      *
      *  </item> <item> If the attribute has no assigned value in the
      * document and has a value of #IMPLIED in the DTD, then the
      * attribute does not appear in the structure model of the
      * document.
      *
      *  </item> </ulist>
      *
      */
     bool specified() const;

     /**
      * On retrieval, the value of the attribute is returned as a
      * string. Character and general entity references are replaced
      * with their values.
      *
      *  On setting, this creates a <code> Text </code> node with the
      * unparsed contents of the string.
      *
      */
     DOMString value() const;

     /**
      * see @ref value
      */
     void setValue( const DOMString & );

     /**
      * Introduced in DOM Level 2
      *
      * The Element node this attribute is attached to or null if this attribute
      * is not in use.
      */
     Element ownerElement() const;

 protected:

     Attr( AttrImpl *_impl );
 };

 class NodeList;
 class Attr;
 class DOMString;

 /**
  * By far the vast majority of objects (apart from text) that authors
  * encounter when traversing a document are <code> Element </code>
  * nodes. Assume the following XML document: &lt;elementExample
  * id=&quot;demo&quot;&gt; &lt;subelement1/&gt;
  * &lt;subelement2&gt;&lt;subsubelement/&gt;&lt;/subelement2&gt;
  * &lt;/elementExample&gt;
  *
  *  When represented using DOM, the top node is an <code> Element
  * </code> node for &quot;elementExample&quot;, which contains two
  * child <code> Element </code> nodes, one for &quot;subelement1&quot;
  * and one for &quot;subelement2&quot;. &quot;subelement1&quot;
  * contains no child nodes.
  *
  *  Elements may have attributes associated with them; since the
  * <code> Element </code> interface inherits from <code> Node </code>
  * , the generic <code> Node </code> interface method <code>
  * getAttributes </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.
  *
  */
 class Element : public Node
 {
     friend class Document;
     friend class HTMLDocument;
 //    friend class AttrImpl;
     friend class Attr;

 public:
     Element();
     Element(const Node &other) : Node()
         {(*this)=other;}
     Element(const Element &other);

     Element & operator = (const Node &other);
     Element & operator = (const Element &other);

     ~Element();

     /**
      * The name of the element. For example, in: &lt;elementExample
      * id=&quot;demo&quot;&gt; ... &lt;/elementExample&gt; , <code>
      * tagName </code> has the value <code> &quot;elementExample&quot;
      * </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.
      *
      */
     DOMString tagName() const;

     /**
      * 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.
      *
      */
     DOMString getAttribute ( const DOMString &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.
      *
      * @param name The name of the attribute to create or alter.
      *
      * @param value Value to set in string form.
      *
      * @return
      *
      * @exception DOMException
      * INVALID_CHARACTER_ERR: Raised if the specified name contains an
      * invalid character.
      *
      *  NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.
      *
      */
     void setAttribute ( const DOMString &name, const DOMString &value );

     /**
      * Removes an attribute by name. If the removed attribute has a
      * default value it is immediately replaced.
      *
      * @param name The name of the attribute to remove.
      *
      * @return
      *
      * @exception DOMException
      * NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.
      *
      */
     void removeAttribute ( const DOMString &name );

     /**
      * Retrieves an <code> Attr </code> node by name.
      *
      * @param name The name of the attribute to retrieve.
      *
      * @return The <code> Attr </code> node with the specified
      * attribute name or <code> null </code> if there is no such
      * attribute.
      *
      */
     Attr getAttributeNode ( const DOMString &name );

     /**
      * Adds a new attribute. If an attribute with that name 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 name, the previously existing
      * <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.
      *
      *  NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.
      *
      *  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.
      *
      */
     Attr setAttributeNode ( const Attr &newAttr );

     /**
      * Removes the specified attribute.
      *
      * @param oldAttr The <code> Attr </code> node to remove from the
      * attribute list. If the removed <code> Attr </code> has a
      * default value it is immediately replaced.
      *
      * @return The <code> Attr </code> node that was removed.
      *
      * @exception DOMException
      * NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.
      *
      *  NOT_FOUND_ERR: Raised if <code> oldAttr </code> is not an
      * attribute of the element.
      *
      */
     Attr removeAttributeNode ( const Attr &oldAttr );

     /**
      * Returns a <code> NodeList </code> of all descendant elements
      * with a given tag name, in the order in which they would be
      * encountered in a preorder traversal of the <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.
      *
      */
     NodeList getElementsByTagName ( const DOMString &name );

     /**
      * Introduced in DOM Level 2
      * Returns a NodeList of all the descendant Elements with a given local
      * name and namespace URI in the order in which they are encountered in a
      * preorder traversal of this Element tree.
      *
      * @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 NodeList object containing all the matched Elements.
      */
     NodeList getElementsByTagNameNS ( const DOMString &namespaceURI,
                                       const DOMString &localName );

     /**
      * Introduced in DOM Level 2.
      *
      * No Exceptions.
      *
      * Retrieves an attribute value by local name and namespace URI. HTML-only
      * DOM implementations do not need to implement this method.
      *
      * @param namespaceURI The namespace URI of the attribute to retrieve.
      *
      * @param localName The local name of the attribute to retrieve.
      *
      * @return The Attr value as a string, or the empty string if that
      * attribute does not have a specified or default value.
      */
     DOMString getAttributeNS ( const DOMString &namespaceURI,
                                const DOMString &localName );

     /**
      * Introduced in DOM Level 2
      *
      * 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 qualifiedName, and its value is changed to
      * be 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 Attr node plus any Text and EntityReference nodes,
      * build the appropriate subtree, and use setAttributeNodeNS or
      * setAttributeNode to assign it as the value of an attribute.
      *
      * HTML-only DOM implementations do not need to implement this method.
      *
      * @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 DOMException
      * INVALID_CHARACTER_ERR: Raised if the specified qualified name contains
      * an illegal character.
      *
      * NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.
      *
      * NAMESPACE_ERR: Raised if the qualifiedName is malformed, if the
      * qualifiedName has a prefix and the namespaceURI is null, if the
      * qualifiedName has a prefix that is "xml" and the namespaceURI is
      * different from "http://www.w3.org/XML/1998/namespace", or if the
      * qualifiedName is "xmlns" and the namespaceURI is different from
      * "http://www.w3.org/2000/xmlns/".
      */
     void setAttributeNS ( const DOMString &namespaceURI,
                           const DOMString &qualifiedName,
                           const DOMString &value );

     /**
      * Introduced in DOM Level 2
      *
      * 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.
      *
      * HTML-only DOM implementations do not need to implement this method.
      *
      * @param namespaceURI The namespace URI of the attribute to remove.
      *
      * @param localName The local name of the attribute to remove.
      *
      * @exception DOMException
      * NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.
      */
     void removeAttributeNS ( const DOMString &namespaceURI,
                              const DOMString &localName );

     /**
      * Introduced in DOM Level 2
      *
      * Retrieves an Attr node by local name and namespace URI. HTML-only DOM
      * implementations do not need to implement this method.
      *
      * @param namespaceURI The namespace URI of the attribute to retrieve.
      *
      * @param localName The local name of the attribute to retrieve.
      *
      * @return The Attr node with the specified attribute local name and
      * namespace URI or null if there is no such attribute.
      */
     Attr getAttributeNodeNS ( const DOMString &namespaceURI,
                               const DOMString &localName );

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

     /**
      * Returns true when an attribute with a given name is specified on this
      * element or has a default value, false otherwise.
      * Introduced in DOM Level 2.
      *
      * @param name The name of the attribute to look for.
      *
      * @return true if an attribute with the given name is specified on this
      * element or has a default value, false otherwise.
      */
     bool hasAttribute( const DOMString& name );

     /**
      * Introduced in DOM Level 2
      *
      * Returns true when an attribute with a given local name and namespace URI
      * is specified on this element or has a default value, false otherwise.
      * HTML-only DOM implementations do not need to implement this method.
      *
      * @param namespaceURI The namespace URI of the attribute to look for.
      *
      * @param localName The local name of the attribute to look for.
      *
      * @return true if an attribute with the given local name and namespace URI
      * is specified or has a default value on this element, false otherwise.
      */
     bool hasAttributeNS ( const DOMString &namespaceURI,
                           const DOMString &localName );

     /**
      * Introduced in DOM Level 2
      * This method is from the CSSStyleDeclaration interface
      *
      * The style attribute
      */
     CSSStyleDeclaration style (  );

     /**
      * @internal
      * not part of the DOM
      */
     bool isHTMLElement() const;

     static bool khtmlValidAttrName(const DOMString &name);
     static bool khtmlValidPrefix(const DOMString &name);
     static bool khtmlValidQualifiedName(const DOMString &name);

     static bool khtmlMalformedQualifiedName(const DOMString &name);
     static bool khtmlMalformedPrefix(const DOMString &name);
 protected:
     Element(ElementImpl *_impl);
 };

 }; //namespace
 #endif
	/*
	* This file is part of the DOM implementation for KDE.
	*
	* (C) 1999 Lars Knoll (knoll@kde.org)
	*
	* This library is free software; you can redistribute it and/or
	* modify it under the terms of the GNU Library General Public
	* License as published by the Free Software Foundation; either
	* version 2 of the License, or (at your option) any later version.
	*
	* This library 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 the GNU
	* Library General Public License for more details.
	*
	* You should have received a copy of the GNU Library General Public License
	* along with this library; see the file COPYING.LIB. If not, write to
	* the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
	* Boston, MA 02111-1307, USA.
	*
	* This file includes excerpts from the Document Object Model (DOM)
	* Level 1 Specification (Recommendation)
	* http://www.w3.org/TR/REC-DOM-Level-1/
	* Copyright © World Wide Web Consortium , (Massachusetts Institute of
	* Technology , Institut National de Recherche en Informatique et en
	* Automatique , Keio University ). All Rights Reserved.
	*
	*/
	#ifndef _DOM_ELEMENT_h_
	#define _DOM_ELEMENT_h_

	#include <dom/dom_node.h>
	#include <dom/css_value.h>

	namespace DOM {

	class DOMString;
	class AttrImpl;
	class Element;
	class ElementImpl;
	class NamedAttrMapImpl;
	class DocumentImpl;

	/**
	* The <code> Attr </code> interface represents an attribute in an
	* <code> Element </code> object. Typically the allowable values for
	* the attribute are defined in a document type definition.
	*
	* <code> Attr </code> objects inherit the <code> Node </code>
	* interface, but since they are not actually child nodes of the
	* element they describe, the DOM does not consider them part of the
	* document tree. Thus, the <code> Node </code> attributes <code>
	* parentNode </code> , <code> previousSibling </code> , and <code>
	* nextSibling </code> have a null value for <code> Attr </code>
	* objects. The DOM takes the view that attributes are properties of
	* elements rather than having a separate identity from the elements
	* they are associated with; this should make it more efficient to
	* implement such features as default attributes associated with all
	* elements of a given type. Furthermore, <code> Attr </code> nodes
	* may not be immediate children of a <code> DocumentFragment </code>
	* . However, they can be associated with <code> Element </code> nodes
	* contained within a <code> DocumentFragment </code> . In short,
	* users and implementors of the DOM need to be aware that <code> Attr
	* </code> nodes have some things in common with other objects
	* inheriting the <code> Node </code> interface, but they also are
	* quite distinct.
	*
	* The attribute's effective value is determined as follows: if this
	* attribute has been explicitly assigned any value, that value is the
	* attribute's effective value; otherwise, if there is a declaration
	* for this attribute, and that declaration includes a default value,
	* then that default value is the attribute's effective value;
	* otherwise, the attribute does not exist on this element in the
	* structure model until it has been explicitly added. Note that the
	* <code> nodeValue </code> attribute on the <code> Attr </code>
	* instance can also be used to retrieve the string version of the
	* attribute's value(s).
	*
	* In XML, where the value of an attribute can contain entity
	* references, the child nodes of the <code> Attr </code> node provide
	* a representation in which entity references are not expanded. These
	* child nodes may be either <code> Text </code> or <code>
	* EntityReference </code> nodes. Because the attribute type may be
	* unknown, there are no tokenized attribute values.
	*
	*/
	class Attr : public Node
	{
	friend class Element;
	friend class Document;
	friend class DocumentImpl;
	friend class HTMLDocument;
	friend class ElementImpl;
	friend class NamedAttrMapImpl;

	public:
	Attr();
	Attr(const Node &other) : Node()
	{(*this)=other;}
	Attr(const Attr &other);

	Attr & operator = (const Node &other);
	Attr & operator = (const Attr &other);

	~Attr();

	/**
	* Returns the name of this attribute.
	*
	*/
	DOMString name() const;

	/**
	* If this attribute was explicitly given a value in the original
	* document, this is <code> true </code> ; otherwise, it is <code>
	* false </code> . Note that the implementation is in charge of
	* this attribute, not the user. If the user changes the value of
	* the attribute (even if it ends up having the same value as the
	* default value) then the <code> specified </code> flag is
	* automatically flipped to <code> true </code> . To re-specify
	* the attribute as the default value from the DTD, the user must
	* delete the attribute. The implementation will then make a new
	* attribute available with <code> specified </code> set to <code>
	* false </code> and the default value (if one exists).
	*
	* In summary: <ulist> <item> If the attribute has an assigned
	* value in the document then <code> specified </code> is <code>
	* true </code> , and the value is the assigned value.
	*
	* </item> <item> If the attribute has no assigned value in the
	* document and has a default value in the DTD, then <code>
	* specified </code> is <code> false </code> , and the value is
	* the default value in the DTD.
	*
	* </item> <item> If the attribute has no assigned value in the
	* document and has a value of #IMPLIED in the DTD, then the
	* attribute does not appear in the structure model of the
	* document.
	*
	* </item> </ulist>
	*
	*/
	bool specified() const;

	/**
	* On retrieval, the value of the attribute is returned as a
	* string. Character and general entity references are replaced
	* with their values.
	*
	* On setting, this creates a <code> Text </code> node with the
	* unparsed contents of the string.
	*
	*/
	DOMString value() const;

	/**
	* see @ref value
	*/
	void setValue( const DOMString & );

	/**
	* Introduced in DOM Level 2
	*
	* The Element node this attribute is attached to or null if this attribute
	* is not in use.
	*/
	Element ownerElement() const;

	protected:

	Attr( AttrImpl *_impl );
	};

	class NodeList;
	class Attr;
	class DOMString;

	/**
	* By far the vast majority of objects (apart from text) that authors
	* encounter when traversing a document are <code> Element </code>
	* nodes. Assume the following XML document: <elementExample
	* id="demo"> <subelement1/>
	* <subelement2><subsubelement/></subelement2>
	* </elementExample>
	*
	* When represented using DOM, the top node is an <code> Element
	* </code> node for "elementExample", which contains two
	* child <code> Element </code> nodes, one for "subelement1"
	* and one for "subelement2". "subelement1"
	* contains no child nodes.
	*
	* Elements may have attributes associated with them; since the
	* <code> Element </code> interface inherits from <code> Node </code>
	* , the generic <code> Node </code> interface method <code>
	* getAttributes </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.
	*
	*/
	class Element : public Node
	{
	friend class Document;
	friend class HTMLDocument;
	// friend class AttrImpl;
	friend class Attr;

	public:
	Element();
	Element(const Node &other) : Node()
	{(*this)=other;}
	Element(const Element &other);

	Element & operator = (const Node &other);
	Element & operator = (const Element &other);

	~Element();

	/**
	* The name of the element. For example, in: <elementExample
	* id="demo"> ... </elementExample> , <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.
	*
	*/
	DOMString tagName() const;

	/**
	* 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.
	*
	*/
	DOMString getAttribute ( const DOMString &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.
	*
	* @param name The name of the attribute to create or alter.
	*
	* @param value Value to set in string form.
	*
	* @return
	*
	* @exception DOMException
	* INVALID_CHARACTER_ERR: Raised if the specified name contains an
	* invalid character.
	*
	* NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.
	*
	*/
	void setAttribute ( const DOMString &name, const DOMString &value );

	/**
	* Removes an attribute by name. If the removed attribute has a
	* default value it is immediately replaced.
	*
	* @param name The name of the attribute to remove.
	*
	* @return
	*
	* @exception DOMException
	* NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.
	*
	*/
	void removeAttribute ( const DOMString &name );

	/**
	* Retrieves an <code> Attr </code> node by name.
	*
	* @param name The name of the attribute to retrieve.
	*
	* @return The <code> Attr </code> node with the specified
	* attribute name or <code> null </code> if there is no such
	* attribute.
	*
	*/
	Attr getAttributeNode ( const DOMString &name );

	/**
	* Adds a new attribute. If an attribute with that name 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 name, the previously existing
	* <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.
	*
	* NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.
	*
	* 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.
	*
	*/
	Attr setAttributeNode ( const Attr &newAttr );

	/**
	* Removes the specified attribute.
	*
	* @param oldAttr The <code> Attr </code> node to remove from the
	* attribute list. If the removed <code> Attr </code> has a
	* default value it is immediately replaced.
	*
	* @return The <code> Attr </code> node that was removed.
	*
	* @exception DOMException
	* NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.
	*
	* NOT_FOUND_ERR: Raised if <code> oldAttr </code> is not an
	* attribute of the element.
	*
	*/
	Attr removeAttributeNode ( const Attr &oldAttr );

	/**
	* Returns a <code> NodeList </code> of all descendant elements
	* with a given tag name, in the order in which they would be
	* encountered in a preorder traversal of the <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.
	*
	*/
	NodeList getElementsByTagName ( const DOMString &name );

	/**
	* Introduced in DOM Level 2
	* Returns a NodeList of all the descendant Elements with a given local
	* name and namespace URI in the order in which they are encountered in a
	* preorder traversal of this Element tree.
	*
	* @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 NodeList object containing all the matched Elements.
	*/
	NodeList getElementsByTagNameNS ( const DOMString &namespaceURI,
	const DOMString &localName );

	/**
	* Introduced in DOM Level 2.
	*
	* No Exceptions.
	*
	* Retrieves an attribute value by local name and namespace URI. HTML-only
	* DOM implementations do not need to implement this method.
	*
	* @param namespaceURI The namespace URI of the attribute to retrieve.
	*
	* @param localName The local name of the attribute to retrieve.
	*
	* @return The Attr value as a string, or the empty string if that
	* attribute does not have a specified or default value.
	*/
	DOMString getAttributeNS ( const DOMString &namespaceURI,
	const DOMString &localName );

	/**
	* Introduced in DOM Level 2
	*
	* 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 qualifiedName, and its value is changed to
	* be 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 Attr node plus any Text and EntityReference nodes,
	* build the appropriate subtree, and use setAttributeNodeNS or
	* setAttributeNode to assign it as the value of an attribute.
	*
	* HTML-only DOM implementations do not need to implement this method.
	*
	* @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 DOMException
	* INVALID_CHARACTER_ERR: Raised if the specified qualified name contains
	* an illegal character.
	*
	* NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.
	*
	* NAMESPACE_ERR: Raised if the qualifiedName is malformed, if the
	* qualifiedName has a prefix and the namespaceURI is null, if the
	* qualifiedName has a prefix that is "xml" and the namespaceURI is
	* different from "http://www.w3.org/XML/1998/namespace", or if the
	* qualifiedName is "xmlns" and the namespaceURI is different from
	* "http://www.w3.org/2000/xmlns/".
	*/
	void setAttributeNS ( const DOMString &namespaceURI,
	const DOMString &qualifiedName,
	const DOMString &value );

	/**
	* Introduced in DOM Level 2
	*
	* 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.
	*
	* HTML-only DOM implementations do not need to implement this method.
	*
	* @param namespaceURI The namespace URI of the attribute to remove.
	*
	* @param localName The local name of the attribute to remove.
	*
	* @exception DOMException
	* NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.
	*/
	void removeAttributeNS ( const DOMString &namespaceURI,
	const DOMString &localName );

	/**
	* Introduced in DOM Level 2
	*
	* Retrieves an Attr node by local name and namespace URI. HTML-only DOM
	* implementations do not need to implement this method.
	*
	* @param namespaceURI The namespace URI of the attribute to retrieve.
	*
	* @param localName The local name of the attribute to retrieve.
	*
	* @return The Attr node with the specified attribute local name and
	* namespace URI or null if there is no such attribute.
	*/
	Attr getAttributeNodeNS ( const DOMString &namespaceURI,
	const DOMString &localName );

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

	/**
	* Returns true when an attribute with a given name is specified on this
	* element or has a default value, false otherwise.
	* Introduced in DOM Level 2.
	*
	* @param name The name of the attribute to look for.
	*
	* @return true if an attribute with the given name is specified on this
	* element or has a default value, false otherwise.
	*/
	bool hasAttribute( const DOMString& name );

	/**
	* Introduced in DOM Level 2
	*
	* Returns true when an attribute with a given local name and namespace URI
	* is specified on this element or has a default value, false otherwise.
	* HTML-only DOM implementations do not need to implement this method.
	*
	* @param namespaceURI The namespace URI of the attribute to look for.
	*
	* @param localName The local name of the attribute to look for.
	*
	* @return true if an attribute with the given local name and namespace URI
	* is specified or has a default value on this element, false otherwise.
	*/
	bool hasAttributeNS ( const DOMString &namespaceURI,
	const DOMString &localName );

	/**
	* Introduced in DOM Level 2
	* This method is from the CSSStyleDeclaration interface
	*
	* The style attribute
	*/
	CSSStyleDeclaration style ( );

	/**
	* @internal
	* not part of the DOM
	*/
	bool isHTMLElement() const;

	static bool khtmlValidAttrName(const DOMString &name);
	static bool khtmlValidPrefix(const DOMString &name);
	static bool khtmlValidQualifiedName(const DOMString &name);

	static bool khtmlMalformedQualifiedName(const DOMString &name);
	static bool khtmlMalformedPrefix(const DOMString &name);
	protected:
	Element(ElementImpl *_impl);
	};

	}; //namespace
	#endif