Document
This interface represents a DOM document, and an object that implements this interface serves as the root of a DOM document tree. Most of the methods defined by the Document interface are "factory methods" that are used to create various types of nodes that can be inserted into this document. Note that there are two versions of the methods for creating attributes and elements. The methods with "NS" in their name are namespace-aware and require the attribute or element name to be specified as a combination of a namespace URI and a local name . You'll notice that throughout the DOM API, methods with "NS" in their names are namespace-aware. Other important methods include the following: getElementsByTagName( ) and its namespace-aware variant getElementsByTagNameNS( ) search the document tree for Element nodes that have the specified tag name and return a NodeList containing those matching nodes. The Element interface defines methods by the same names that search only within the subtree defined by an Element . getElementById( ) is a related method that searches the document tree for a single element with the specified unique value for an ID attribute. This is useful when you use an ID attribute to uniquely identify certain tags within an XML document. Note that this method does not search for attributes that are named "id" or "ID". It searches for attributes whose XML type (as declared in the document's DTD) is ID . Such attributes are often named "id", but this is not required. An XML document must have a single root element. getdocumentElement( ) returns this Element object. Note, however that this does not mean that a Document node has only one child. It must have exactly one child that is an Element , but it can also have other children such as Comment and ProcessingInstruction nodes. The geTDoctype( ) method returns the DocumentType object (or null if there isn't one) that represents the document's DTD. getImplementation( ) returns the the DOMImplementation object that represents the DOM implementation that created this document tree. Figure 21-5. org.w3c.dom.Document public interface Document extends Node { // Public Instance Methods 5.0 Node adoptNode (Node source ) throws DOMException; Attr createAttribute (String name ) throws DOMException; Attr createAttributeNS (String namespaceURI , String qualifiedName ) throws DOMException; CDATASection createCDATASection (String data ) throws DOMException; Comment createComment (String data ); DocumentFragment createDocumentFragment ( ); Element createElement (String tagName ) throws DOMException; Element createElementNS (String namespaceURI , String qualifiedName ) throws DOMException; EntityReference createEntityReference (String name ) throws DOMException; ProcessingInstruction createProcessingInstruction (String target , String data ) throws DOMException; Text createTextNode (String data ); DocumentType getDoctype ( ); Element getDocumentElement ( ); 5.0 String getDocumentURI ( ); 5.0 DOMConfiguration getDomConfig ( ); Element getElementById (String elementId ); NodeList getElementsByTagName (String tagname ); NodeList getElementsByTagNameNS (String namespaceURI , String localName ); DOMImplementation getImplementation ( ); 5.0 String getInputEncoding ( ); 5.0 boolean getStrictErrorChecking ( ); 5.0 String getXmlEncoding ( ); 5.0 boolean getXmlStandalone ( ); 5.0 String getXmlVersion ( ); Node importNode (Node importedNode , boolean deep ) throws DOMException; 5.0 void normalizeDocument ( ); 5.0 Node renameNode (Node n , String namespaceURI , String qualifiedName ) throws DOMException; 5.0 void setDocumentURI (String documentURI ); 5.0 void setStrictErrorChecking (boolean strictErrorChecking ); 5.0 void setXmlStandalone (boolean xmlStandalone ) throws DOMException; 5.0 void setXmlVersion (String xmlVersion ) throws DOMException; } Returned Byjavax.xml.parsers.DocumentBuilder.{newDocument( ) , parse( )} , DOMImplementation.createDocument( ) , Node.getOwnerDocument( )  |
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