Added note in section "From JSON to JSON-LD" that the JSON-LD document in the example doesn't define the subject.
--- a/spec/latest/index.html Tue Aug 30 17:12:45 2011 +0200
+++ b/spec/latest/index.html Tue Aug 30 18:17:13 2011 +0200
@@ -681,6 +681,9 @@
<p>Doing this allows JSON to be unambiguously machine-readable without
requiring developers to drastically change their workflow.</p>
+<p class="note">Please note that this JSON-LD document doesn't define the
+subject and will thus result in an unlabeled or blank node.</p>
+
</section>
</section>