add URLs to profile spec section

oac.html

@@ -811,9 +811,14 @@ <h2 id="x3-spec">
     </h2>
     <p>
       This ODRL profile relies on the invocation of legal concepts using DPV and ACL for the reference to access mode operations.
-      Its core concepts are the Preference and Requirement policies, a new set of operators to constraint the defined Purposes, Recipients, Legal Basis, 
-      Technical and Organisational Measures, Technology and Identity Provider constraints (which will require the usage of DPV's taxonomies), 
-      new properties to specify policies for applications and services, Processing and Access actions, as well as Personal Data Categories, and Legal Entities.
+      Its core concepts are the <a href="./oac.html#x2-1-1-1-preference">Preference</a> and <a href="./oac.html#x2-1-1-2-requirement">Requirement</a> policies, 
+      a new set of <a href="./oac.html#x2-1-2-operators">operators</a> to constraint the defined <a href="./oac.html#x2-5-1-purpose">Purposes</a>, 
+      <a href="./oac.html#x2-5-2-recipient">Recipients</a>, <a href="./oac.html#x2-5-3-legal-basis">Legal Basis</a>, 
+      <a href="./oac.html#x2-5-4-tom">Technical and Organisational Measures</a>, <a href="./oac.html#x2-5-5-tech">Technology</a> and 
+      <a href="./oac.html#x2-5-6-idp">Identity Provider</a> constraints (which will require the usage of DPV's taxonomies), 
+      new properties to specify policies for <a href="./oac.html#x2-1-3-2-application">applications</a> and <a href="./oac.html#x2-1-3-1-service">services</a>, 
+      <a href="./oac.html#x2-3-2-processing">Processing</a> and <a href="./oac.html#x2-3-1-access">Access actions</a>, as well as 
+      <a href="./oac.html#x2-2-1-personal-data">Personal Data</a> categories, and <a href="./oac.html#x2-4-1-entity">Entities</a>.
     </p>
     <section id="base-concepts">
       <h3 id="x2-1-base-concepts">