diff --git a/support/schemas/problemformat.cue b/support/schemas/problemformat.cue
index 336aeb17..a3570946 100644
--- a/support/schemas/problemformat.cue
+++ b/support/schemas/problemformat.cue
@@ -1,25 +1,14 @@
 package problemformat
 
 // Schemas relevant for the problem package format specification.
+problem_package_format: string | *"legacy"
 
-// Names for testgroups and testcases are alphanumerical with internal
-// underscores and hyphens; such as "huge", "make_tree", "3", or "connected_graph-01",
-// but not "huge_" or "-2".
-let basename = "([A-Za-z0-9][A-Za-z0-9_-]*[A-Za-z0-9]|[A-Za-z0-9])"
-name: =~"^\(basename)$"
 
-// Filenames are somewhat like names, but can also contain '.'
-// and have length at least 2, such as "good-solution_02.py"
-// but not "huge_" or "a".
-let filename = "[A-Za-z0-9][A-Za-z0-9_.-]*[A-Za-z0-9]"
-
-filepath: =~"^/?\(filename)(/\(filename))*$"
-casepath: =~"^\(filename)(/\(basename))*$"
 
 // Test data settings
 
 #testdata_settings: {
-	input_validator_flags?:  *"" | string | {[string]: string}
+	input_validator_flags?: *"" | string | {[string]: string}
 	output_validator_flags?: *"" | string
 	grading?: {
 		score?:       >0