module core {
    interface DOMImplementation {
        boolean hasFeature(in DOMString feature, 
                           in [ConvertNullToNullString] DOMString version);
                           
                           
        DocumentType createDocumentType(in DOMString qualifiedName,
                                        in DOMString publicId,
                                        in DOMString systemId)
            raises(DOMException);
            
        Document createDocument(in [ConvertNullToNullString] DOMString namespaceURI, 
                                in [ConvertNullToNullString] DOMString qualifiedName, 
                                in [ConvertNullToNullString] DocumentType doctype)
            raises(DOMException);

        CSSStyleSheet createCSSStyleSheet(in DOMString title,
                                          in DOMString media)
            raises(DOMException);
            
        HTMLDocument createHTMLDocument(in DOMString title);
    };
}