[fpc-pascal] OOP and XML usage

[Anthony Walter]

I've written some XML classes which expose themselves as interfaces.
Usage goes something like this:

procedure SaveSettings(const Settings: string);
var
  Document: IDocument;
  Filer: IFiler;
begin
  Document := CreateDocument;
  Filer := Document.ForceRoot('test') as IFiler;
  Filer.WriteTime('time', Now);
  Filer.WriteString('application', Application.ExeName);
  Document.SaveToFile(Settings);
end;

<test><time>21:11:17</time><application>test.exe</application></test>

procedure ShowPerson;
var
  Document: IDocument;
  Root: INode;
begin
  Document := CreateDocument;
  Filer := Document.ForceRoot('data');
  Root.ForceNode('person/age').Value = 17;
  Root.FindNode('person[age = 17]').Filer.Write('Jason');
  Root.Filer.Write('person/salary', 10000);
  ShowMessage(Document.Text);
end;


<data><person><age>17</age><name>Jason</name><salary>10000</salary></person><data>