diff --git a/Makefile b/Makefile
index 35a2c2c6..057130ed 100644
--- a/Makefile
+++ b/Makefile
@@ -24,6 +24,7 @@ endef # cddl_targets
 
 $(eval $(call cddl_targets,corim,$(CORIM_FRAGS)))
 $(eval $(call cddl_targets,comid,$(COMID_FRAGS)))
+$(eval $(call cddl_targets,cotl,$(COTL_FRAGS)))
 $(eval $(call cddl_targets,intrep,$(INTREP_FRAGS)))
 
 cddl/concise-swid-tag.cddl: ; $(MAKE) -C cddl $(notdir $@)
diff --git a/cddl/Makefile b/cddl/Makefile
index 86bd75c8..964ebe04 100644
--- a/cddl/Makefile
+++ b/cddl/Makefile
@@ -11,6 +11,7 @@ check:: cbor-tags-unique
 check:: check-intrep check-intrep-examples
 check:: check-corim check-corim-examples
 check:: check-comid check-comid-examples
+check:: check-cotl check-cotl-examples
 
 # $1: label
 # $2: cddl fragments
@@ -63,6 +64,7 @@ endef # cddl_check_template
 include corim-frags.mk
 
 $(eval $(call cddl_check_template,comid,$(COMID_FRAGS),$(COMID_EXAMPLES)))
+$(eval $(call cddl_check_template,cotl,$(COTL_FRAGS),$(COTL_EXAMPLES)))
 $(eval $(call cddl_check_template,corim,$(CORIM_FRAGS),$(CORIM_EXAMPLES)))
 $(eval $(call cddl_check_template,intrep,$(INTREP_FRAGS),$(INTREP_EXAMPLES)))
 
diff --git a/cddl/corim-frags.mk b/cddl/corim-frags.mk
index 597a18cd..138d9a55 100644
--- a/cddl/corim-frags.mk
+++ b/cddl/corim-frags.mk
@@ -50,6 +50,17 @@ COMID_FRAGS += concise-swid-tag.cddl
 
 COMID_EXAMPLES := $(wildcard examples/comid-*.diag)
 
+COTL_FRAGS := concise-tl-tag.cddl
+COTL_FRAGS += validity-map.cddl
+COTL_FRAGS += version-map.cddl
+COTL_FRAGS += tag-id-type-choice.cddl
+COTL_FRAGS += tag-identity-map.cddl
+COTL_FRAGS += uuid.cddl
+COTL_FRAGS += tag-version-type.cddl
+COTL_FRAGS += concise-swid-tag.cddl
+
+COTL_EXAMPLES := $(wildcard examples/cotl-*.diag)
+
 CORIM_FRAGS := corim.cddl
 CORIM_FRAGS += concise-tl-tag.cddl
 CORIM_FRAGS += concise-tag-type-choice.cddl
diff --git a/cddl/examples/cotl-1.diag b/cddl/examples/cotl-1.diag
new file mode 100644
index 00000000..2a3b044d
--- /dev/null
+++ b/cddl/examples/cotl-1.diag
@@ -0,0 +1,21 @@
+/ concise-tl-tag / {
+  / cotl.tag-identity / 0 : {
+    / cotl.tag-id / 0 : h'3f06af63a93c11e4979700505690773a',
+    / cotl.tag-version / 1 : 1
+  },
+  / cotl.tags-list / 1 : [ {
+    / comid.tag-id / 0 : h'3f06af63a93c11e4979700505690773e'
+  },
+  {
+    / comid.tag-id / 0 : h'3f06af63a93c11e4979700505690773f',
+    / comid.tag-version / 1 : 5
+  },
+  {
+    / coswid.tag-id / 0 : h'3f06af63a93c11e4979700505690774f',
+    / coswid.tag-version / 1 : 2
+  }],
+  / cotl.tl-validity / 2 : {
+    / cotl.not-before / 0 : 1(1234),
+    / cotl.not-after / 1 : 1(4567)
+  }
+}