Reference IDocument

  IDocument = interface(INode)
  public
    { Format the document with indentation }
    procedure Beautify;
    { Create a new attribute node owned by the document }
    function CreateAttribute(const Name: string): INode;
    { Create a new element node owned by the document }
    function CreateElement(const Name: string): INode;
    { Load the document from a file }
    procedure Load(const FileName: string);
    { Save the document to a file }
    procedure Save(const FileName: string);
    { The root element of the document }
    property Root: INode read GetRoot write SetRoot;
  end;