diff --git a/custom_signatures.yml b/custom_signatures.yml
index 21df082..36099bc 100644
--- a/custom_signatures.yml
+++ b/custom_signatures.yml
@@ -106,3 +106,8 @@
   plain_bof: mimetypeapplication/vnd.oasis.opendocument.spreadsheet
   puid: aca-fmt/21
   signature: OpenDocument Spreadsheet (unspecified version)
+- bof: YWFycz0iaHR0cDovL3d3dy5hYXJzLmRrL2dtbC9hYXJzIg==
+  extension: .xsd
+  plain_bof: aars="http://www.aars.dk/gml/aars"
+  puid: aca-fmt/22
+  signature: XML Schema Definition (Custom XSD)
\ No newline at end of file
diff --git a/fileformats.yml b/fileformats.yml
index 72ec613..11f25a6 100644
--- a/fileformats.yml
+++ b/fileformats.yml
@@ -107,6 +107,14 @@ aca-fmt/21:
       converter_type: master
       outputs:
         - pdf
+aca-fmt/22:
+  name: XML Schema Definition (Custom XSD)
+  action: convert
+  convert:
+    - converter: copy
+      converter_type: statutory
+      outputs:
+        - *
 fmt/3:
   name: Graphics Interchange Format 87a
   action: convert
@@ -2676,12 +2684,11 @@ x-fmt/266:
     dir_suffix: .archive_extraction
 x-fmt/280:
   name: XML Schema Definition
-  action: convert
-  convert:
-    - converter: copy
-      converter_type: statutory
-      outputs:
-        - *
+  action: reidentify
+  reidentify:
+    reason: If the XSD is not custom made, then we ignore the XSD file.
+  ignore:
+    reason: A prescriptive XML template, for validating XML files with. Not preservation-worthy if not with a GML file.
 x-fmt/315:
   name: Document Type Definition
   action: convert
@@ -2703,7 +2710,7 @@ x-fmt/332:
     reason: It's a file containing formatting information for Lotus spreadsheets.
       Not preservation-worthy
 x-fmt/340:
-  name: ''
+  name: 'Lotus WordPro Document'
   action: convert
   convert:
     - converter: symphovert