diff -r eadaf0b8f02e -r a9b98b16b053 server/src/app/Libraries/CocoonUtils.php
--- a/server/src/app/Libraries/CocoonUtils.php	Fri Nov 27 17:59:36 2015 +0100
+++ b/server/src/app/Libraries/CocoonUtils.php	Tue Dec 01 13:33:08 2015 +0100
@@ -3,6 +3,33 @@
 
 class CocoonUtils {
 
+    const OLAC_ROLES = [
+        'http://www.language-archives.org/OLAC/1.1/annotator',
+        'http://www.language-archives.org/OLAC/1.1/author',
+        'http://www.language-archives.org/OLAC/1.1/compiler',
+        'http://www.language-archives.org/OLAC/1.1/consultant',
+        'http://www.language-archives.org/OLAC/1.1/data_inputter',
+        'http://www.language-archives.org/OLAC/1.1/depositor',
+        'http://www.language-archives.org/OLAC/1.1/developer',
+        'http://www.language-archives.org/OLAC/1.1/editor',
+        'http://www.language-archives.org/OLAC/1.1/illustrator',
+        'http://www.language-archives.org/OLAC/1.1/interpreter',
+        'http://www.language-archives.org/OLAC/1.1/interviewer',
+        'http://www.language-archives.org/OLAC/1.1/participant',
+        'http://www.language-archives.org/OLAC/1.1/performer',
+        'http://www.language-archives.org/OLAC/1.1/photographer',
+        'http://www.language-archives.org/OLAC/1.1/recorder',
+        'http://www.language-archives.org/OLAC/1.1/researcher',
+        'http://www.language-archives.org/OLAC/1.1/research_participant',
+        'http://www.language-archives.org/OLAC/1.1/responder',
+        'http://www.language-archives.org/OLAC/1.1/signer',
+        'http://www.language-archives.org/OLAC/1.1/singer',
+        'http://www.language-archives.org/OLAC/1.1/speaker',
+        'http://www.language-archives.org/OLAC/1.1/sponsor',
+        'http://www.language-archives.org/OLAC/1.1/transcriber',
+        'http://www.language-archives.org/OLAC/1.1/translator',
+    ];
+
     /**
      * Extract id form cocoon url.
      *