public Block BuildDocument(int indentation)
{
Paragraph p = new Paragraph();
p.Inlines.Add(new Run("repeat") { Foreground = StyleSettings.KeyWordColor });
p.Inlines.Add(" (");
p.Inlines.AddRange(Expression.BuildDocument());
p.Inlines.Add(")");
Section s = new Section() { Margin = new Thickness(indentation, 0, 0, 0) };
s.Blocks.Add(p);
s.Blocks.Add(Body.BuildDocument(indentation));
return s;
}