/*
 * 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>DOMImplementation</code> interface provides a number of methods 
 * for performing operations that are independent of any particular instance 
 * of the document object model.
 */
public interface DOMImplementation {
    /**
     *  Test if the DOM implementation implements a specific feature.
     * @param feature  The name of the feature to test (case-insensitive). The 
     *   legal values are defined throughout this specification and listed in 
     *   the  section. The name must be an  XML name . To avoid possible 
     *   conflicts, as a convention, names referring to features defined 
     *   outside the DOM spec should be made unique by reversing the name of 
     *   the Internet domain name of the person (or the organization that 
     *   person belongs to) who defines the feature, component by component, 
     *   and use this as a prefix. For instance, the W3C SYMM Working Group 
     *   defines the feature "org.w3c.dom.smil".
     * @param version  This is the version number of the feature to test. In 
     *   Level 2, this is the string "2.0". If the version is not specified, 
     *   supporting any version of the feature causes the method to return 
     *   <code>true</code> .
     * @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. It is expected that a future 
     * version of the DOM will provide a way for populating a 
     * <code>DocumentType</code> .
     * <br> HTML-only DOM implementations do not need to implement this method.
     * @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 
     *   contains an illegal character.
     *   <br> NAMESPACE_ERR: Raised if the <code>qualifiedName</code> is 
     *   malformed.
     * @since DOM Level 2
     */
    public DocumentType createDocumentType(String qualifiedName, 
                                           String publicId, 
                                           String systemId)
                                           throws DOMException;

    /**
     *  Creates an XML <code>Document</code> object of the specified type with 
     * its document element. HTML-only DOM implementations do not need to 
     * implement this method.
     * @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.
     * @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.
     * @exception DOMException
     *    INVALID_CHARACTER_ERR: Raised if the specified qualified name 
     *   contains an illegal character.
     *   <br> NAMESPACE_ERR: Raised if the <code>qualifiedName</code> is 
     *   malformed, or 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".
     *   <br> WRONG_DOCUMENT_ERR: Raised if <code>doctype</code> has already 
     *   been used with a different document.
     * @since DOM Level 2
     */
    public Document createDocument(String namespaceURI, 
                                   String qualifiedName, 
                                   DocumentType doctype)
                                   throws DOMException;

}