code: public String getString(String key) throws LazyException{
  		LazyNode token=getFieldToken(key);
  		return token.getStringValue();
  	}
docs: Returns the string value stored in this object for the given key.
  
  @param key the name of the field on this object
  @return the requested string value
  @throws LazyException if the value for the given key was not a string.