TXMLDocument use case (Delphi)

Description

This example illustrates the basic operations on an XML document.

Code

procedure CreateDocument;
const
  CFilename = 'file.xml';
var
  LDocument: IXMLDocument;
  LNodeElement, NodeCData, NodeText: IXMLNode;
begin
  LDocument := TXMLDocument.Create(nil);
  LDocument.Active := True;

  { Define document content. }
  LDocument.DocumentElement := LDocument.CreateNode('ThisIsTheDocumentElement', ntElement, '');
  LDocument.DocumentElement.Attributes['attrName'] := 'attrValue';
  LNodeElement := LDocument.DocumentElement.AddChild('ThisElementHasText', -1);
  LNodeElement.Text := 'Inner text.';
  NodeCData := LDocument.CreateNode('any characters here', ntCData, '');
  LDocument.DocumentElement.ChildNodes.Add(NodeCData);
  NodeText := LDocument.CreateNode('This is a text node.', ntText, '');
  LDocument.DocumentElement.ChildNodes.Add(NodeText);

  LDocument.SaveToFile(CFilename);
end;

procedure RetrieveDocument;
const
  CFilename = 'file.xml';
  CAttrName = 'attrName';
  HTAB = #9;
var
  LDocument: IXMLDocument;
  LNodeElement, LNode: IXMLNode;
  LAttrValue: string;
  I: Integer;
begin
  LDocument := TXMLDocument.Create(nil);
  LDocument.LoadFromFile(CFilename);

  { Find a specific node }
  LNodeElement := LDocument.ChildNodes.FindNode('ThisIsTheDocumentElement');

  if (LNodeElement <> nil) then
  begin
    { Get a specific attribute }
    Writeln('Getting attribute...');
    if (LNodeElement.HasAttribute(CAttrName)) then
    begin
      LAttrValue := LNodeElement.Attributes[CAttrName];
      Writeln('Attribute value: ' + LAttrValue);
    end;

    { Traverse child nodes }
    Writeln(sLineBreak, 'Traversing child nodes...' + sLineBreak);
    for I := 0 to LNodeElement.ChildNodes.Count - 1 do
    begin
      LNode := LNodeElement.ChildNodes.Get(I);
      { Display node name }
      Writeln(sLineBreak + 'Node name: ' + LNode.NodeName);
      { Check if the node type is Text. }
      if LNode.NodeType = ntText then
      begin
        Writeln(HTAB + 'This is a node of type Text. The text is: ' + LNode.Text);
      end;
      { Check if the node is text element. }
      if LNode.IsTextElement then
      begin
        Writeln(HTAB + 'This is a text element. The text is: ' + LNode.Text);
      end;
    end;
  end;
end;