diff --git a/util/loader.py b/util/loader.py
index 2cfd491..5b6bbaf 100644
--- a/util/loader.py
+++ b/util/loader.py
@@ -4,7 +4,7 @@ from concrete_syntax.textual_od import parser
 from transformation.rule import Rule
 
 # parse model and check conformance
-def parse_and_check(state, m_cs, mm, descr: str):
+def parse_and_check(state, m_cs, mm, descr: str, check_conformance=True):
     try:
         m = parser.parse_od(
             state,
@@ -15,10 +15,11 @@ def parse_and_check(state, m_cs, mm, descr: str):
         e.add_note("While parsing model " + descr)
         raise
     try:
-        conf = Conformance(state, m, mm)
-        errors = conf.check_nominal()
-        if len(errors) > 0:
-            print(render_conformance_check_result(errors))
+        if check_conformance:
+            conf = Conformance(state, m, mm)
+            errors = conf.check_nominal()
+            if len(errors) > 0:
+                print(render_conformance_check_result(errors))
     except Exception as e:
         e.add_note("In model " + descr)
         raise
@@ -32,7 +33,7 @@ def read_file(filename):
 KINDS = ["nac", "lhs", "rhs"]
 
 # load model transformation rules
-def load_rules(state, get_filename, rt_mm_ramified, rule_names):
+def load_rules(state, get_filename, rt_mm_ramified, rule_names, check_conformance=True):
     rules = {}
 
     files_read = []
@@ -50,7 +51,7 @@ def load_rules(state, get_filename, rt_mm_ramified, rule_names):
                     while True:
                         base, ext = os.path.splitext(filename)
                         processed_filename = base+suffix+ext
-                        nac = parse_and_check(state, read_file(processed_filename), rt_mm_ramified, descr)
+                        nac = parse_and_check(state, read_file(processed_filename), rt_mm_ramified, descr, check_conformance)
                         nacs.append(nac)
                         suffix = "2" if suffix == "" else str(int(suffix)+1)
                         files_read.append(processed_filename)
@@ -60,7 +61,7 @@ def load_rules(state, get_filename, rt_mm_ramified, rule_names):
                 return nacs
             elif kind == "lhs" or kind == "rhs":
                 try:
-                    m = parse_and_check(state, read_file(filename), rt_mm_ramified, descr)
+                    m = parse_and_check(state, read_file(filename), rt_mm_ramified, descr, check_conformance)
                     files_read.append(filename)
                     return m
                 except FileNotFoundError as e:
@@ -70,7 +71,8 @@ def load_rules(state, get_filename, rt_mm_ramified, rule_names):
                         state,
                         "",
                         rt_mm_ramified,
-                        descr="'"+filename+"'")
+                        descr="'"+filename+"'",
+                        check_conformance=check_conformance)
 
         rules[rule_name] = Rule(*(parse(kind) for kind in KINDS))