diff --git a/AcdhArcheAssets/formats.json b/AcdhArcheAssets/formats.json
index cf0bed6..f17c629 100644
--- a/AcdhArcheAssets/formats.json
+++ b/AcdhArcheAssets/formats.json
@@ -1367,6 +1367,22 @@
       "comment" : "",
       "extensions" : ["psd"],
       "name" : "Photoshop (Adobe)"
+   },
+    {
+      "ARCHE_category" : "https://vocabs.acdh.oeaw.ac.at/archecategory/model",
+      "ARCHE_docs" : "",
+      "ARCHE_conformance": "accepted",
+      "Further_specifications" : "",
+      "IANA_reference" : "",
+      "IANA_template" : "",
+      "Informal_MIME_type" : [],
+      "Long_term_format" : "",
+      "MIME_type" : ["application/xml", "text/xml"],
+      "Magic_number" : "",
+      "PRONOM_ID" : "",
+      "comment" : "",
+      "extensions" : ["rng"],
+      "name" : "REgular LAnguage for XML Next Generation (RELAX NG)"
    },
    {
       "ARCHE_category" : "https://vocabs.acdh.oeaw.ac.at/archecategory/text",