diff --git a/bindings/python/dlite-misc-python.i b/bindings/python/dlite-misc-python.i
index c93db9c54..efd6e1021 100644
--- a/bindings/python/dlite-misc-python.i
+++ b/bindings/python/dlite-misc-python.i
@@ -84,6 +84,29 @@ class errctl():
 silent = errctl(hide=True)
 """Context manager for a silent code block.  Same as `errctl(hide=True)`."""
 
+class HideDLiteWarnings():
+    """Context manager for hiding warnings.
+
+    Arguments:
+        hide: If true, hide warnings if `pattern` is None or `pattern`
+            matches the warning message.
+            If false, hide warnings if `pattern` is given and don't
+            match the warning message.
+        pattern: Optional glob pattern matching the warning message.
+
+    """
+    def __init__(self, hide=True, pattern=None):
+        self.hide = int(hide)
+        self.pattern = pattern
+
+    def __enter__(self):
+        self._oldstate = get_warnings_hide()
+        set_warnings_hide(self.hide, self.pattern)
+
+    def __exit__(self, *exc):
+        set_warnings_hide(*self._oldstate)
+
+
 # A set for keeping track of already issued deprecation warnings
 _deprecation_warning_record = set()
 
diff --git a/bindings/python/dlite-misc.i b/bindings/python/dlite-misc.i
index d4d6758f3..6a2ce71ec 100644
--- a/bindings/python/dlite-misc.i
+++ b/bindings/python/dlite-misc.i
@@ -72,7 +72,6 @@
     return 0;
   }
 
-
 %}
 
 %include <stdint.i>
@@ -242,6 +241,17 @@ void _dlite_err_mask_set(int64_t mask);
 void errcheck(void);
 
 
+%feature("docstring", "\
+Return a list with the `[hide, pattern]` parameters for controlling whether
+warnings are shown.
+") dlite_get_warnings_hide;
+int dlite_get_warnings_hide(const char **ARGOUT);
+
+%feature("docstring", "Sets parameters controlling whether to hide warnings.")
+  dlite_set_warnings_hide;
+void dlite_set_warnings_hide(int hide, char *pattern=NULL);
+
+
 /* ------------------------------
  * Expose other utility functions
  * ------------------------------ */
diff --git a/bindings/python/dlite-python.i b/bindings/python/dlite-python.i
index 531eb97b3..78433ad27 100644
--- a/bindings/python/dlite-python.i
+++ b/bindings/python/dlite-python.i
@@ -1340,6 +1340,24 @@ PyObject *dlite_run_file(const char *path, PyObject *globals, PyObject *locals)
  * Argout typemaps
  * --------------- */
 
+/* Argout string */
+/* Assumes that *ARGOUT is const buffer owned by the wrapped function */
+%typemap("doc") (const char **ARGOUT) "string"
+%typemap(in,numinputs=0) (const char **ARGOUT) (char *tmp=NULL) {
+  $1 = &tmp;
+}
+%typemap(argout) (const char **ARGOUT) {
+  PyObject *argout;
+  if (tmp$argnum) {
+    argout = PyUnicode_FromString(tmp$argnum);
+  } else {
+    argout = Py_None;
+    Py_INCREF(argout);
+  }
+  $result = SWIG_Python_AppendOutput($result, argout, 0);
+}
+
+
 /* Argout string */
 /* Assumes that *ARGOUT_STRING is malloc()'ed by the wrapped function */
 %typemap("doc") (char **ARGOUT_STRING, size_t *LENGTH) "string"
diff --git a/bindings/python/tests/test_collection.py b/bindings/python/tests/test_collection.py
index c190ba72d..967c6d53e 100644
--- a/bindings/python/tests/test_collection.py
+++ b/bindings/python/tests/test_collection.py
@@ -87,12 +87,8 @@
 assert inst1b != inst2
 
 # Cannot add an instance with an existing label
-try:
+with raises(dlite.DLiteValueError):
     coll.add("inst1", inst2)
-except dlite.DLiteError:
-    pass
-else:
-    raise RuntimeError("should not be able to replace an existing instance")
 
 coll.add("inst1", inst2, force=True)  # forced replacement
 assert coll.get("inst1") == inst2
diff --git a/bindings/python/tests/test_collection_load.py b/bindings/python/tests/test_collection_load.py
index 9cb9b527c..e04e4c6d0 100644
--- a/bindings/python/tests/test_collection_load.py
+++ b/bindings/python/tests/test_collection_load.py
@@ -21,5 +21,6 @@
 
 # Check that we can load collection from dict
 d = json.load(open(indir / "coll.json", "r"))
-coll = instance_from_dict(d)
+with dlite.HideDLiteWarnings():
+    coll = instance_from_dict(d)
 assert coll.nrelations == 6
diff --git a/bindings/python/tests/test_entity.py b/bindings/python/tests/test_entity.py
index fe3ad2a6d..5a7afe254 100644
--- a/bindings/python/tests/test_entity.py
+++ b/bindings/python/tests/test_entity.py
@@ -17,10 +17,14 @@
 dlite.storage_path.append(indir / "*.json")
 dlite.storage_path.append(entitydir / "*.json")
 
+# Hide warnings
+dlite.set_warnings_hide(
+    True, "Warning: Could not load the following Python plugins:*"
+)
 
 # Load metadata (i.e. an instance of meta-metadata) from url
 myentity = Instance.from_url(f"json://{entitydir}/MyEntity.json")
-print(myentity.uuid)
+#print(myentity.uuid)
 
 # Check some properties of the entity
 assert myentity.uuid == "a0e63529-3397-5c4f-a56c-14bf07ecc219"
@@ -74,12 +78,13 @@
 
 
 # Print the value of all properties
-for i in range(len(inst)):
-    print("prop%d:" % i, inst[i])
+# for i in range(len(inst)):
+#     print("prop%d:" % i, inst[i])
 
 # String representation (as json)
 # print(inst)
 
+
 # Check save and load
 inst.save(f"json://{outdir}/test_entity_inst.json?mode=w")
 inst2 = Instance.from_url(f"json://{outdir}/test_entity_inst.json")
@@ -115,7 +120,8 @@
 del inst2
 
 # Make sure we fail with an exception for pathetic cases
-with raises(dlite.DLiteStorageOpenError):
+# FIXME: a part of the error message is not hidden...
+with raises(dlite.DLiteError):
     Instance.from_location("json", "/", "mode=r")
 
 with raises(dlite.DLiteStorageLoadError):
@@ -156,7 +162,8 @@
 
 # Check pickling
 s = pickle.dumps(inst)
-inst3 = pickle.loads(s)
+with dlite.HideDLiteWarnings():
+    inst3 = pickle.loads(s)
 
 dim = Dimension("N")
 
@@ -235,7 +242,8 @@
 except ImportError:
     pass
 else:
-    inst.save(f"yaml://{outdir}/test_entity.yaml?mode=w")
+    with dlite.HideDLiteWarnings():
+        inst.save(f"yaml://{outdir}/test_entity.yaml?mode=w")
 
 
 # Test metadata
diff --git a/bindings/python/tests/test_jstore.py b/bindings/python/tests/test_jstore.py
index 2f543f4bf..9bbbc7060 100644
--- a/bindings/python/tests/test_jstore.py
+++ b/bindings/python/tests/test_jstore.py
@@ -72,7 +72,8 @@
 # Test format_dict(), dimension as list of numbers - need metadata
 js = dlite.JStore()
 js.load_dict(D1)
-meta = js.get()
+with dlite.HideDLiteWarnings():
+    meta = js.get()
 assert dlite.format_dict(d3, soft7=True, single=True) == d1
 assert dlite.format_dict(d3, soft7=False, single=True) == d2
 
@@ -200,9 +201,8 @@
 assert len(dct) == 2
 
 
-
-
 key1 = next(js.get_ids())
 # d1 = js.get_dict(key1)
 s1 = js.get_json(key1)
-inst1 = js.get(key1)
+with dlite.HideDLiteWarnings():
+    inst1 = js.get(key1)
diff --git a/bindings/python/tests/test_misc.py b/bindings/python/tests/test_misc.py
index 2760bd14e..f988d98ca 100755
--- a/bindings/python/tests/test_misc.py
+++ b/bindings/python/tests/test_misc.py
@@ -49,7 +49,8 @@
 print("No DLite error message is printed to screen:")
 try:
     with dlite.errctl(hide=(dlite.DLiteStorageOpenError, dlite.DLiteError)):
-        dlite.Instance.from_location("-", "__non-existing__")
+        with dlite.HideDLiteWarnings():
+            dlite.Instance.from_location("-", "__non-existing__")
 except dlite.DLiteStorageOpenError:
     pass
 
diff --git a/src/dlite-misc.c b/src/dlite-misc.c
index 0c2554a4b..9127e0162 100644
--- a/src/dlite-misc.c
+++ b/src/dlite-misc.c
@@ -16,6 +16,7 @@
 #include "utils/session.h"
 #include "utils/rng.h"
 #include "utils/uri_encode.h"
+#include "utils/globmatch.h"
 #include "getuuid.h"
 #include "dlite.h"
 #include "dlite-macros.h"
@@ -487,8 +488,13 @@ int dlite_add_dll_path(void)
 
 /* Local state for this module. */
 typedef struct {
-  int in_atexit;
-  int finalizing;
+  int in_atexit;           // whether we are in atexit()
+  int finalizing;          // whether dlite is finalising
+  int warnings_hide;       // whether to hide warnings
+  char *warnings_pattern;  // If given and `warnings_hide` is true, hide
+                           // warnings matching the glob pattern.  Otherwise,
+                           // if `warnings_hide` is false, show only
+                           // warnings matching the glob pattern.
 } Locals;
 
 
@@ -501,6 +507,7 @@ Locals *_locals=NULL;
 /* Free variables in local state. */
 static void free_locals()
 {
+  if (_locals && _locals->warnings_pattern) free(_locals->warnings_pattern);
   _locals = NULL;
 }
 
@@ -561,6 +568,47 @@ void dlite_globals_set(DLiteGlobals *globals_handler)
     err_set_state(g);
 }
 
+/*
+  Return parameters controlling whether warnings should be hidden.
+
+  See dlite_set_warnings_hide() for a description of these parameters.
+
+  If `*pattern` is not NULL, it is assigned to a static pointer to
+  `warnings_pattern` (owned by DLite).
+
+  Returns `warnings_hide`.
+ */
+int dlite_get_warnings_hide(const char **pattern)
+{
+  Locals *locals = get_locals();
+  if (pattern) *pattern = locals->warnings_pattern;
+  return locals->warnings_hide;
+}
+
+/*
+  Set parameters controlling whether warnings should be hidden.
+
+  Warning parameters:
+    - `warnings_hide`: whether to hide warnings (see below).
+    - `warnings_pattern`: glob pattern matching the warning message.
+
+  If `warnings_pattern` is NULL, warnings are hidden if `warnings_hide`
+  is non-zero.
+
+  If `warnings_pattern` is given, then warnings are hidden if:
+    - `warnings_pattern` match the warning message and `warnings_hide` is
+      non-zero.
+    - `warnings_pattern` don't match the warning message and `warnings_hide`
+      is zero.
+ */
+void dlite_set_warnings_hide(int hide, char *pattern)
+{
+  Locals *locals = get_locals();
+  locals->warnings_hide = hide;
+  if (locals->warnings_pattern) free(locals->warnings_pattern);
+  locals->warnings_pattern = (pattern) ? strdup(pattern) : NULL;
+}
+
 
 /* Error handler for DLite.
 
@@ -569,15 +617,39 @@ void dlite_globals_set(DLiteGlobals *globals_handler)
  */
 static void dlite_err_handler(const ErrRecord *record)
 {
+  Locals *locals = get_locals();
+
+  if (getenv("DLITE_DEBUG")
 #ifdef WITH_PYTHON
-  if (record->level != errLevelError ||
-      getenv("DLITE_PYDEBUG") ||
-      !dlite_err_ignored_get(record->eval))
+      || getenv("DLITE_PYDEBUG")
+#endif
+      ) {
     err_default_handler(record);
-#else  /* WITH_PYTHON */
-  if (!dlite_err_ignored_get(record->eval))
+    return;
+  }
+
+  switch (record->level) {
+  case errLevelSuccess:
+    break;
+  case errLevelWarn:
+    if (locals->warnings_pattern) {
+      int match = !globmatch(locals->warnings_pattern, record->msg);
+      if ((match && !locals->warnings_hide) ||
+          (!match && locals->warnings_hide))
+        err_default_handler(record);
+    } else if (!locals->warnings_hide) {
+        err_default_handler(record);
+    }
+    break;
+  case errLevelError:
+    if (!dlite_err_ignored_get(record->eval))
+      err_default_handler(record);
+    break;
+  case errLevelException:
+  case errLevelFatal:
     err_default_handler(record);
-#endif
+    break;
+  }
 }
 
 /* dlite_errname() with correct call signature */
diff --git a/src/dlite-misc.h b/src/dlite-misc.h
index 945614c1d..2bd8c07ff 100644
--- a/src/dlite-misc.h
+++ b/src/dlite-misc.h
@@ -308,6 +308,43 @@ void dlite_globals_set_atexit(void);
 /** @} */
 
 
+/**
+  @name Functions controlling whether to hide warnings
+
+  Warning parameters:
+    - `warnings_hide`: whether to hide warnings (see below).
+    - `warnings_pattern`: glob pattern matching the warning message.
+
+  If `warnings_pattern` is NULL, warnings are hidden if `warnings_hide`
+  is non-zero.
+
+  If `warnings_pattern` is not NULL, then warnings are hidden if:
+    - `warnings_pattern` match the warning message and `warnings_hide` is
+      non-zero.
+    - `warnings_pattern` don't match the warning message and `warnings_hide`
+      is zero.
+  @{
+*/
+
+/**
+  Return parameters controlling whether warnings should be hidden.
+
+  If `*pattern` is not NULL, it is assigned to a static pointer to
+  `warnings_pattern` (owned by DLite).
+
+  Returns `warnings_hide`.
+ */
+
+int dlite_get_warnings_hide(const char **pattern);
+
+/**
+  Set parameters controlling whether warnings should be hidden.
+ */
+void dlite_set_warnings_hide(int hide, char *pattern);
+
+/** @} */
+
+
 /**
   @name Wrappers around error functions
   The `DLITE_NOERR()` and `DLITE_NOERR_END` macros are intended to
diff --git a/src/utils/tests/test_globmatch.c b/src/utils/tests/test_globmatch.c
index d1b9f75b5..4cc8f5f4f 100644
--- a/src/utils/tests/test_globmatch.c
+++ b/src/utils/tests/test_globmatch.c
@@ -12,13 +12,21 @@ MU_TEST(test_globmatch)
 {
   mu_check(0 == globmatch("", ""));
   mu_check(1 == globmatch("?", ""));
+  mu_check(0 == globmatch("?", "a"));
   mu_check(0 == globmatch("*", ""));
   mu_check(0 == globmatch("?etc*", "/etc/fstab"));
+  mu_check(0 == globmatch("*etc*", "/etc/fstab"));
+  mu_check(1 == globmatch("etc*", "/etc/fstab"));
+  mu_check(0 == globmatch("*tc*", "/etc/fstab"));
+  mu_check(1 == globmatch("*x*", "/etc/fstab"));
   mu_check(0 == globmatch("/[a-f]tc*", "/etc/fstab"));
   mu_check(0 == globmatch("[^A-Za-z]etc*", "/etc/fstab"));
   mu_check(1 == globmatch("[A-Za-z]etc*", "/etc/fstab"));
   mu_check(0 == globmatch("\\/etc*", "/etc/fstab"));
   mu_check(0 == globmatch("?etc*tab", "/etc/fstab"));
+  mu_check(0 == globmatch("*", "a\nstring\nover multiple\nlines...\n"));
+  mu_check(1 == globmatch("*.", "a\nstring\nover multiple\nlines...\n"));
+  mu_check(0 == globmatch("*", "Warning: Behavior change `storageQuery` is not configured. It will be enabled by default from v0.6.0. See https://sintef.github.io/dlite/user_guide/configure_behavior_changes.html for more info."));
 }
 
 /***********************************************************************/