diff --git a/ocrd_tool.schema.yml b/ocrd_tool.schema.yml
index 509990b..4413425 100644
--- a/ocrd_tool.schema.yml
+++ b/ocrd_tool.schema.yml
@@ -29,7 +29,8 @@ properties:
           - steps
           - executable
           - categories
-          - input_file_grp
+          # Not required because not all processors take input from a file group
+          # - input_file_grp
           # Not required because not all processors produce output files
           # - output_file_grp
         properties:
@@ -37,17 +38,22 @@ properties:
             description: The name of the CLI executable in $PATH
             type: string
           input_file_grp:
-            description: Input fileGrp@USE this tool expects by default
+            description: Input fileGrp@USE examples for this tool
             type: array
             items:
-              type: string
-              pattern: '^OCR-D-[A-Z0-9-]+$'
+                type: string
+                # Naming convention is obsolete
+                # pattern: '^OCR-D-[A-Z0-9-]+$'
+            default: ['INPUT']
+            #  pattern: '^OCR-D-[A-Z0-9-]+$'
           output_file_grp:
-            description: Output fileGrp@USE this tool produces by default
+            description: Output fileGrp@USE examples for this tool
             type: array
             items:
               type: string
-              pattern: '^OCR-D-[A-Z0-9-]+$'
+            # Naming convention is obsolete
+            #  pattern: '^OCR-D-[A-Z0-9-]+$'
+            default: ['OUTPUT']
           parameters:
             description: Object describing the parameters of a tool. Keys are parameter names, values sub-schemas.
             type: object