public virtual Span Span(string elementId)
 {
     return(AllElements.Span(elementId));
 }
 public virtual Span Span(Constraint findBy)
 {
     return(AllElements.Span(findBy));
 }
 public virtual Span Span(Predicate <Span> predicate)
 {
     return(AllElements.Span(predicate));
 }
 public virtual Span Span(Regex elementId)
 {
     return(AllElements.Span(elementId));
 }