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/*

 * Copyright (c) 2004 World Wide Web Consortium,

 *

 * (Massachusetts Institute of Technology, European Research Consortium for

 * Informatics and Mathematics, Keio University). All Rights Reserved. This

 * work is distributed under the W3C(r) Software License [1] 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.

 *

 * [1] http://www.w3.org/Consortium/Legal/2002/copyright-software-20021231

 */

package org.w3c.dom;

/**

 * The <code>DOMImplementation</code> interface provides a number of methods

 * for performing operations that are independent of any particular instance

 * of the document object model.

 * <p>See also the <a href='http://www.w3.org/TR/2004/REC-DOM-Level-3-Core-20040407'>Document Object Model (DOM) Level 3 Core Specification</a>.

 */

public interface DOMImplementation {

    /**

     * Test if the DOM implementation implements a specific feature and

     * version, as specified in .

     * @param feature  The name of the feature to test.

     * @param version  This is the version number of the feature to test.

     * @return <code>true</code> if the feature is implemented in the

     *   specified version, <code>false</code> otherwise.

     */

    public boolean hasFeature(String feature,

                              String version);

    /**

     * Creates an empty <code>DocumentType</code> node. Entity declarations

     * and notations are not made available. Entity reference expansions and

     * default attribute additions do not occur..

     * @param qualifiedName The qualified name of the document type to be

     *   created.

     * @param publicId The external subset public identifier.

     * @param systemId The external subset system identifier.

     * @return A new <code>DocumentType</code> node with

     *   <code>Node.ownerDocument</code> set to <code>null</code>.

     * @exception DOMException

     *   INVALID_CHARACTER_ERR: Raised if the specified qualified name is not

     *   an XML name according to [<a href='http://www.w3.org/TR/2004/REC-xml-20040204'>XML 1.0</a>].

     *   <br>NAMESPACE_ERR: Raised if the <code>qualifiedName</code> is

     *   malformed.

     *   <br>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 [<a href='http://www.w3.org/TR/1999/REC-html401-19991224/'>HTML 4.01</a>]).

     * @since DOM Level 2

     */

    public DocumentType createDocumentType(String qualifiedName,

                                           String publicId,

                                           String systemId)

                                           throws DOMException;

    /**

     * Creates a DOM Document object of the specified type with its document

     * element.

     * <br>Note that based on the <code>DocumentType</code> given to create

     * the document, the implementation may instantiate specialized

     * <code>Document</code> objects that support additional features than

     * the "Core", such as "HTML" [<a href='http://www.w3.org/TR/2003/REC-DOM-Level-2-HTML-20030109'>DOM Level 2 HTML</a>]

     * . On the other hand, setting the <code>DocumentType</code> after the

     * document was created makes this very unlikely to happen.

     * Alternatively, specialized <code>Document</code> creation methods,

     * such as <code>createHTMLDocument</code> [<a href='http://www.w3.org/TR/2003/REC-DOM-Level-2-HTML-20030109'>DOM Level 2 HTML</a>]

     * , can be used to obtain specific types of <code>Document</code>

     * objects.

     * @param namespaceURI The namespace URI of the document element to

     *   create or <code>null</code>.

     * @param qualifiedName The qualified name of the document element to be

     *   created or <code>null</code>.

     * @param doctype The type of document to be created or <code>null</code>.

     *   When <code>doctype</code> is not <code>null</code>, its

     *   <code>Node.ownerDocument</code> attribute is set to the document

     *   being created.

     * @return A new <code>Document</code> object with its document element.

     *   If the <code>NamespaceURI</code>, <code>qualifiedName</code>, and

     *   <code>doctype</code> are <code>null</code>, the returned

     *   <code>Document</code> is empty with no document element.

     * @exception DOMException

     *   INVALID_CHARACTER_ERR: Raised if the specified qualified name is not

     *   an XML name according to [<a href='http://www.w3.org/TR/2004/REC-xml-20040204'>XML 1.0</a>].

     *   <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>, or if the

     *   <code>qualifiedName</code> is <code>null</code> and the

     *   <code>namespaceURI</code> is different from <code>null</code>, or

     *   if the <code>qualifiedName</code> has a prefix that is "xml" and

     *   the <code>namespaceURI</code> is different from "<a href='http://www.w3.org/XML/1998/namespace'>

     *   http://www.w3.org/XML/1998/namespace</a>" [<a href='http://www.w3.org/TR/1999/REC-xml-names-19990114/'>XML Namespaces</a>]

     *   , or if the DOM implementation does not support the

     *   <code>"XML"</code> feature but a non-null namespace URI was

     *   provided, since namespaces were defined by XML.

     *   <br>WRONG_DOCUMENT_ERR: Raised if <code>doctype</code> has already

     *   been used with a different document or was created from a different

     *   implementation.

     *   <br>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 [<a href='http://www.w3.org/TR/1999/REC-html401-19991224/'>HTML 4.01</a>]).

     * @since DOM Level 2

     */

    public Document createDocument(String namespaceURI,

                                   String qualifiedName,

                                   DocumentType doctype)

                                   throws DOMException;

    /**

     *  This method returns a specialized object which implements the

     * specialized APIs of the specified feature and version, as specified

     * in . The specialized object may also be obtained by using

     * binding-specific casting methods but is not necessarily expected to,

     * as discussed in . This method also allow the implementation to

     * provide specialized objects which do not support the

     * <code>DOMImplementation</code> interface.

     * @param feature  The name of the feature requested. Note that any plus

     *   sign "+" prepended to the name of the feature will be ignored since

     *   it is not significant in the context of this method.

     * @param version  This is the version number of the feature to test.

     * @return  Returns an object which implements the specialized APIs of

     *   the specified feature and version, if any, or <code>null</code> if

     *   there is no object which implements interfaces associated with that

     *   feature. If the <code>DOMObject</code> returned by this method

     *   implements the <code>DOMImplementation</code> interface, it must

     *   delegate to the primary core <code>DOMImplementation</code> and not

     *   return results inconsistent with the primary core

     *   <code>DOMImplementation</code> such as <code>hasFeature</code>,

     *   <code>getFeature</code>, etc.

     * @since DOM Level 3

     */

    public Object getFeature(String feature,

                             String version);

}