RDF is not a markup, changed to RDF/XML and Turtle as examples of marking up RDF.
--- a/spec/latest/json-ld-syntax/index.html Wed Jan 11 12:18:23 2012 +0800
+++ b/spec/latest/json-ld-syntax/index.html Wed Jan 11 10:46:10 2012 -0800
@@ -1754,7 +1754,7 @@
RDF may be found in [[RDF-PRIMER]].</p>
<p>The JSON-LD markup examples below demonstrate how JSON-LD can be used to
- express semantic data marked up in other languages such as RDF, RDFa, Microformats,
+ express semantic data marked up in other languages such as RDF/XML, Turtle, RDFa, Microformats,
and Microdata. These sections are merely provided as proof that JSON-LD is
very flexible in what it can express across different <tref>Linked Data</tref> approaches.
Details of transforming JSON-LD into RDF are defined in [[JSON-LD-API]].</p>