Add note about processing enveloped content as RDF.

index.html

@@ -2484,12 +2484,13 @@ <h4>Enveloped Verifiable Credentials</h4>
             </dd>
           </dl>
 
-        <p>
+          <p>
 The example below shows a [=verifiable presentation=] that contains an
 enveloped [=verifiable credential=]:
-        </p>
+          </p>
 
-        <pre class="example nohighlight" title="Basic structure of a presentation">
+          <pre class="example nohighlight"
+               title="Basic structure of a presentation">
 {
   "@context": [
     "https://www.w3.org/ns/credentials/v2",
@@ -2502,7 +2503,15 @@ <h4>Enveloped Verifiable Credentials</h4>
     "type": "EnvelopedVerifiableCredential"
   }]</span>
 }
-        </pre>
+          </pre>
+
+          <p class="note" title="Processing enveloped content as RDF">
+It is possible that an implementer might want to process the object described in
+this section, and the enveloped presentation expressed by the `id` value, in an
+RDF environment and create linkages between the objects that are relevant to
+RDF. The desire and mechanisms for doing so are use case dependent and will,
+thus, be implementation dependent.
+          </p>
 
         </section>