+#### VOCABULARY_URL
+Local path, or any URL that allows cross-origin requests. See
+[Vocabulary JSON file example](public/vocabulary-example.json).
+
+### FILE_VIEWERS_CONFIG_URL
+Local path, or any URL that allows cross-origin requests. See:
+
+[File viewers config file example](public/file-viewers-example.json)
+
+[File viewers config scheme](src/models/file-viewers-config.ts)
+