添加？登录XML.DocumentElement

这不是文档元素.它甚至不是一个元素,而是一个Processing Instruction,它碰巧是XML声明,有时也称为XML prolog.

要指定XML声明的属性,请改用:

xmlDoc.CreateProcessingInstruction('xml', 'version="1.0" encoding="UTF-8"');

例如:

{$APPTYPE CONSOLE}

uses
  OmniXML;

var
  XMLDoc: IXMLDocument;
  ProcessingInstruction: IXMLProcessingInstruction;
  DocumentElement: IXMLElement;
begin
  XMLDoc := CreateXMLDoc;
  ProcessingInstruction := XMLDoc.CreateProcessingInstruction('xml',
    'version="1.0" encoding="UTF-8"');
  DocumentElement := XMLDoc.CreateElement('foo');

  XMLDoc.DocumentElement := DocumentElement;
  XMLDoc.InsertBefore(ProcessingInstruction, DocumentElement);

  XMLDoc.Save('foo.xml', ofIndent);
end.