package edu.stanford.rt.credential;

/**
 * @author Ninghui Li, Sandra Qiu<br>
 *
 * An empty super class for <code>PublicKeyPrincipal</code> and 
 * <code>DataValuePrincipal</code>.
 * 
 */
public class Principal implements PrincipalExpression
{
    public String toString(String indent)
    {
        return indent;
    }
}