Check for @index key before allowing usage of @language map.
--- a/spec/latest/json-ld-api/index.html Mon Feb 18 15:47:09 2013 +0100
+++ b/spec/latest/json-ld-api/index.html Mon Feb 18 10:19:35 2013 -0500
@@ -2843,7 +2843,8 @@
If <em>value</em> contains the key <code>@value</code>:
<ol class="algorithm">
<li>
- If <em>value</em> contains the key <code>@language</code>,
+ If <em>value</em> contains the key <code>@language</code>
+ and does not contain the key <code>@index</code>,
then set <em>typeOrLanguageValue</em> to its associated
value and append <code>@language</code> to
<em>containers</em>.