Add check for value is null to IRI compaction algorithm.
--- a/spec/latest/json-ld-api/index.html Sat Jun 30 21:37:44 2012 -0400
+++ b/spec/latest/json-ld-api/index.html Sat Jun 30 21:45:52 2012 -0400
@@ -1,4 +1,4 @@
-<!DOCTYPE html>
+sope<!DOCTYPE html>
<html>
<head>
<title>JSON-LD API 1.0</title>
@@ -1321,7 +1321,8 @@
<li>If <em>term</em> has a <code>@container</code> set to <code>@set</code>, continue
to the next <em>term</em>.</li>
<li>If <em>list container</em> is <code>true</code> and <em>term</em> does not have a
- <code>container</code> set to <code>@list</code>, continue to the next <em>term</em>.</li>
+ <code>container</code> set to <code>@list</code> and <em>value</em> is <tref>null</tref>,
+ continue to the next <em>term</em>.</li>
</ol>
</li>
<li>Otherwise, if <em>term</em> has a <code>container</code> set to <code>@list</code>,