diff -r d97eda8bc8ec -r 821253d361d1 server/src/app/Services/BnfResolverInterface.php
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/server/src/app/Services/BnfResolverInterface.php	Thu Feb 25 21:26:15 2016 +0100
@@ -0,0 +1,20 @@
+<?php
+namespace CorpusParole\Services;
+
+interface BnfResolverInterface {
+
+    /**
+     * Get name from Viaf id
+     * @param string $id The id to resolve. Can be an url starting with http://data.bnf.fr/ or http://ark.bnf.fr/
+     * @return a string with the name
+     */
+    public function getLabel($id);
+
+    /**
+     * Get a list of names from an array of viaf ids.
+     * @param array $ids The array of ids to resolve.
+     *                   Each id can be an url starting with http://data.bnf.fr/ or http://ark.bnf.fr/
+     */
+    public function getLabels(array $ids);
+
+}