Use abstract syntax linked to its definition

Author: niklasl

spec/index.html

@@ -944,8 +944,7 @@ <h3>IRIs</h3>
       is a <a>string</a> that conforms to the syntax
       defined in RFC 3987 [[!RFC3987]].</p>
 
-    <p>For an IRI in a <a data-lt="concrete RDF syntax">concrete syntax</a> to conform to the
-      <a>abstract syntax</a>, it
+    <p>An IRI in the RDF <a>abstract syntax</a>
       MUST be <a data-cite="RFC3986#section-5">resolved</a> per [[RFC3986]] and
       MUST NOT be a <a data-cite="RFC3986#section-4.2">relative reference</a>.
       An IRI MAY contain a <a data-cite="RFC3986#section-3.5">fragment identifier</a>.