Implementation error?

[Saran Kong <kongsaran@gmail.com>]

Dear Rong,

In Locatable class constructor, "links" must not be null or empty, otherwise error will 
be triggered.

if (links != null && links.isEmpty()) {
           throw new 
IllegalArgumentException("empty links");
}

However, in Locatable subclasses such as Party, Actor, Person, etc., 
"links" can be null if not 
specified.
  It is also stated in the specification that links will 
have the optionality of "0...1". 
Is it an error or is intended?

Cheers,
-- 
Kong SARAN
Information and Communication Technology
Kano
 Lab
Waseda University, Japan




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