diff -r 009efee954f7 -r 17f10b56c079 server/src/app/Models/WebResourceManager.php
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/server/src/app/Models/WebResourceManager.php	Thu Jun 02 18:24:19 2016 +0200
@@ -0,0 +1,35 @@
+<?php
+namespace CorpusParole\Models;
+
+use EasyRdf\Resource;
+
+/**
+ */
+class WebResourceManager {
+
+    public static function getResource(...$args) {
+
+        list($url,$graph) = $args;
+        $webResource = new Resource($url, $graph);
+        $formatLit = $webResource->getLiteral("dc11:format");
+        $format = is_null($formatLit)?null:$formatLit->getValue();
+        if(is_null($format)) {
+            throw new ModelsException("WebResourceManager: No dc:11 format on web resource");
+        }
+
+        if(0 === strpos($format, 'audio/') ||
+           0 === strpos($format, 'video/') ||
+           0 === strpos($format, 'Sampling:') ) {
+            return new MediaResource(...$args);
+        } else if(
+            0 === strpos($format, 'application/xml') ||
+            0 === strpos($format, 'application/pdf') ) {
+            return new TranscriptResource(...$args);
+        }
+        else {
+            throw new ModelsException("WebResourceManager: unknown format");
+        }
+
+    }
+
+}
\ No newline at end of file