oai-pmh.md

@@ -154,7 +154,7 @@ The mapping used:
 | application/pdf | Document       |
 | image/png       | Picture        |
 | video/mp4       | Video          |
-|                 | Misccellaneous |
+|                 | Miscellaneous |
 
 ## Changes in future Release:
 - no Media Type mapping, use of mime/type as is
@@ -167,6 +167,8 @@ With oerhub version 1.3 and above we introduce Software Package Data Exchange (s
 </lom:description>
 ```
 This uri is expected: `https://spdx.org/licenses/<Identifier>`. <Identifier> is the Short Identifier. The link shows the remarks of the license.
+### Language codes and translation
+Our own vocabs are archived in our index (Opensearch). The data is based on `https://www.loc.gov/standards/iso639-2/php/code_list.php`.
 
 ## Links
 - https://www.openarchives.org/
@@ -182,5 +184,6 @@ This uri is expected: `https://spdx.org/licenses/<Identifier>`. <Identifier> is
 - https://www.doi.org/
 - https://creativecommons.org/
 - https://spdx.org/licenses/
+- https://www.loc.gov/standards/iso639-2/php/code_list.php
 - https://www.openeducation.at/
 - https://oerhub.at/
\ No newline at end of file