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