diff --git a/validation/Is1_Ip1_LAtUFR.ttl b/validation/Is1_Ip1_LAtUFR.ttl
new file mode 100644
index 00000000..fe4f38ae
--- /dev/null
+++ b/validation/Is1_Ip1_LAtUFR.ttl
@@ -0,0 +1 @@
+<http://a.example/s1>  <http://a.example/p1> "septante"@FR .
diff --git a/validation/Is1_Ip1_LabLTUEN-UFR-UJURA.ttl b/validation/Is1_Ip1_LabLTUEN-UFR-UJURA.ttl
new file mode 100644
index 00000000..cc9dff3a
--- /dev/null
+++ b/validation/Is1_Ip1_LabLTUEN-UFR-UJURA.ttl
@@ -0,0 +1 @@
+<http://a.example/s1>  <http://a.example/p1> "ab"@EN-FR-JURA .
diff --git a/validation/Is1_Ip1_LabLTUEN-UFR.ttl b/validation/Is1_Ip1_LabLTUEN-UFR.ttl
new file mode 100644
index 00000000..c5323632
--- /dev/null
+++ b/validation/Is1_Ip1_LabLTUEN-UFR.ttl
@@ -0,0 +1 @@
+<http://a.example/s1>  <http://a.example/p1> "ab"@EN-FR .
diff --git a/validation/Is1_Ip1_LabLTUEN.ttl b/validation/Is1_Ip1_LabLTUEN.ttl
new file mode 100644
index 00000000..a5a77a57
--- /dev/null
+++ b/validation/Is1_Ip1_LabLTUEN.ttl
@@ -0,0 +1 @@
+<http://a.example/s1>  <http://a.example/p1> "ab"@EN .
diff --git a/validation/manifest.jsonld b/validation/manifest.jsonld
index 60a0c4e4..d5493047 100644
--- a/validation/manifest.jsonld
+++ b/validation/manifest.jsonld
@@ -4241,7 +4241,7 @@
           "status": "mf:Approved"
         },
         {
-          "@id": "#1val1LANGTAG_pass",
+          "@id": "#1val1LANGTAG_passLabLTen-fr",
           "@type": "sht:ValidationTest",
           "action": {
             "schema": "../schemas/1val1LANGTAG.shex",
@@ -4250,13 +4250,30 @@
             "focus": "http://a.example/s1"
           },
           "extensionResults": [],
-          "name": "1val1LANGTAG_pass",
+          "name": "1val1LANGTAG_passLabLTen-fr",
           "trait": [
             "LanguageTagEquivalence"
           ],
           "comment": "<S> { <p1> ['ab'@en-fr] } on { <s1> <p1> 'ab'@en-fr }",
           "status": "mf:Approved"
         },
+        {
+          "@id": "#1val1LANGTAG_passLabLTEN-FR",
+          "@type": "sht:ValidationTest",
+          "action": {
+            "schema": "../schemas/1val1LANGTAG.shex",
+            "shape": "http://a.example/S1",
+            "data": "Is1_Ip1_LabLTUEN-UFR.ttl",
+            "focus": "http://a.example/s1"
+          },
+          "extensionResults": [],
+          "name": "1val1LANGTAG_passLabLTEN-FR",
+          "trait": [
+            "LanguageCase"
+          ],
+          "comment": "<S> { <p1> ['ab'@en-fr] } on { <s1> <p1> 'ab'@EN-FR }",
+          "status": "mf:proposed"
+        },
         {
           "@id": "#1val1LANGTAG_Lab",
           "@type": "sht:ValidationFailure",
@@ -4291,6 +4308,23 @@
           "comment": "<S> { <p1> ['ab'@en-fr] } on { <s1> <p1> 'ab'@en }",
           "status": "mf:Approved"
         },
+        {
+          "@id": "#1val1LANGTAG_LabLTEN",
+          "@type": "sht:ValidationFailure",
+          "action": {
+            "schema": "../schemas/1val1LANGTAG.shex",
+            "shape": "http://a.example/S1",
+            "data": "Is1_Ip1_LabLTUEN.ttl",
+            "focus": "http://a.example/s1"
+          },
+          "extensionResults": [],
+          "name": "1val1LANGTAG_LabLTEN",
+          "trait": [
+            "LanguageCase"
+          ],
+          "comment": "<S> { <p1> ['ab'@en-fr] } on { <s1> <p1> 'ab'@EN }",
+          "status": "mf:proposed"
+        },
         {
           "@id": "#1val1LANGTAG_LabLTen-fr-jura",
           "@type": "sht:ValidationFailure",
@@ -4308,6 +4342,23 @@
           "comment": "<S> { <p1> ['ab'@en-fr] } on { <s1> <p1> 'ab'@en-fr-jura }",
           "status": "mf:Approved"
         },
+        {
+          "@id": "#1val1LANGTAG_LabLTEN-FR-JURA",
+          "@type": "sht:ValidationFailure",
+          "action": {
+            "schema": "../schemas/1val1LANGTAG.shex",
+            "shape": "http://a.example/S1",
+            "data": "Is1_Ip1_LabLTUEN-UFR-UJURA.ttl",
+            "focus": "http://a.example/s1"
+          },
+          "extensionResults": [],
+          "name": "1val1LANGTAG_LabLTEN-FR-JURA",
+          "trait": [
+            "LanguageCase"
+          ],
+          "comment": "<S> { <p1> ['ab'@en-fr] } on { <s1> <p1> 'ab'@EN-FR-JURA }",
+          "status": "mf:proposed"
+        },
         {
           "@id": "#1val1LANGTAG_LaLTen-fr",
           "@type": "sht:ValidationFailure",
@@ -12682,6 +12733,25 @@
           "comment": "<S> { <p1> [@fr~-@fr-be-@fr-cd-@fr-ch] } on { <s1> <p1> 'septante'@fr }",
           "status": "mf:Approved"
         },
+        {
+          "@id": "#1val1languageStemMinuslanguage3_passLAtFR",
+          "@type": "sht:ValidationTest",
+          "action": {
+            "schema": "../schemas/1val1languageStemMinuslanguage3.shex",
+            "shape": "http://a.example/S1",
+            "data": "Is1_Ip1_LAtUFR.ttl",
+            "focus": "http://a.example/s1"
+          },
+          "extensionResults": [],
+          "name": "1val1languageStemMinuslanguage3_passLAtFR",
+          "trait": [
+            "Stem",
+            "ValueSet",
+            "LanguageCase"
+          ],
+          "comment": "<S> { <p1> [@fr-@fr-be-@fr-cd-@fr-ch] } on { <s1> <p1> 'septante'@FR }",
+          "status": "mf:proposed"
+        },
         {
           "@id": "#1val1languageStemMinuslanguage3_passLAtfr-FR",
           "@type": "sht:ValidationTest",
@@ -12826,6 +12896,25 @@
           "comment": "<S> { <p1> [@fr~-@fr-be~-@fr-cd~-@fr-ch~] } on { <s1> <p1> 'septante'@fr }",
           "status": "mf:Approved"
         },
+        {
+          "@id": "#1val1languageStemMinuslanguageStem3_passLAtFR",
+          "@type": "sht:ValidationTest",
+          "action": {
+            "schema": "../schemas/1val1languageStemMinuslanguageStem3.shex",
+            "shape": "http://a.example/S1",
+            "data": "Is1_Ip1_LAtUFR.ttl",
+            "focus": "http://a.example/s1"
+          },
+          "extensionResults": [],
+          "name": "1val1languageStemMinuslanguageStem3_passLAtFR",
+          "trait": [
+            "Stem",
+            "ValueSet",
+            "LanguageCase"
+          ],
+          "comment": "<S> { <p1> [@fr~-@fr-be~-@fr-cd~-@fr-ch] } on { <s1> <p1> 'septante'@FR }",
+          "status": "mf:proposed"
+        },
         {
           "@id": "#1val1languageStemMinuslanguageStem3_LAtfrc",
           "@type": "sht:ValidationFailure",
diff --git a/validation/manifest.ttl b/validation/manifest.ttl
index e00a1dc1..30fae185 100644
--- a/validation/manifest.ttl
+++ b/validation/manifest.ttl
@@ -13,6 +13,8 @@
 @prefix prov:   <http://www.w3.org/ns/prov#> .
 
  # TODO:
+ #   unify At and LT (both indicate language tag)
+ #   @en-fr examples could reuse @fr-{be,cd,ch,fr}
  #   focus* on empty.ttl
  #   ../schemas/1IRI_with_all_punctuationdot.shex
  #   ../schemas/1IRI_with_UCHAR.1dot.shex
@@ -318,10 +320,13 @@
         <#1val1DOUBLElowercase_0_0e0>
 
 ####     language tag equivalence
-        <#1val1LANGTAG_pass>            # <S> { <p1> ['ab'@en-fr] }
+        <#1val1LANGTAG_passLabLTen-fr>            # <S> { <p1> ['ab'@en-fr] }
+        <#1val1LANGTAG_passLabLTEN-FR>            # <S> { <p1> ['ab'@en-fr] }
         <#1val1LANGTAG_Lab>
         <#1val1LANGTAG_LabLTen>
+        <#1val1LANGTAG_LabLTEN>
         <#1val1LANGTAG_LabLTen-fr-jura>
+        <#1val1LANGTAG_LabLTEN-FR-JURA>
         <#1val1LANGTAG_LaLTen-fr>
 
 ####     datatyped literal equivalence
@@ -829,6 +834,7 @@
         <#1val1languageStem_fail>
         <#1val1literallanguageStem_failLAtfr>
         <#1val1languageStemMinuslanguage3_passLAtfr>
+        <#1val1languageStemMinuslanguage3_passLAtFR>
         <#1val1languageStemMinuslanguage3_passLAtfr-FR>
         <#1val1literallanguageStemMinusliterallanguage3_failLAtfr-FR>
         <#1val1languageStemMinuslanguage3_failLAtfr-be>
@@ -837,6 +843,7 @@
         <#1val1languageStemMinuslanguage3_failLAtfr-ch>
         <#1val1languageStemMinuslanguage3_passLAtfr-be-fbcl>
         <#1val1languageStemMinuslanguageStem3_passLAtfr>
+        <#1val1languageStemMinuslanguageStem3_passLAtFR>
         <#1val1languageStemMinuslanguageStem3_LAtfrc>
         <#1val1languageStemMinuslanguageStem3_passLAtfr-FR>
         <#1val1languageStemMinuslanguageStem3_LAtfr-be>
@@ -4672,8 +4679,8 @@
 ####     } numeric equivalence
 ####     language tag equivalence {
 
-<#1val1LANGTAG_pass> a sht:ValidationTest ;
-    mf:name "1val1LANGTAG_pass" ;
+<#1val1LANGTAG_passLabLTen-fr> a sht:ValidationTest ;
+    mf:name "1val1LANGTAG_passLabLTen-fr" ;
     sht:trait sht:LanguageTagEquivalence ;
     rdfs:comment "<S> { <p1> ['ab'@en-fr] } on { <s1> <p1> 'ab'@en-fr }" ;
     mf:status mf:Approved ;
@@ -4685,6 +4692,19 @@
     ]
     .
 
+<#1val1LANGTAG_passLabLTEN-FR> a sht:ValidationTest ;
+    mf:name "1val1LANGTAG_passLabLTEN-FR" ;
+    sht:trait sht:LanguageCase ;
+    rdfs:comment "<S> { <p1> ['ab'@en-fr] } on { <s1> <p1> 'ab'@EN-FR }" ;
+    mf:status mf:proposed ;
+    mf:action [
+      sht:schema <../schemas/1val1LANGTAG.shex> ;
+      sht:shape <http://a.example/S1> ;
+      sht:data <Is1_Ip1_LabLTUEN-UFR.ttl> ;
+      sht:focus <http://a.example/s1>
+    ]
+    .
+
 <#1val1LANGTAG_Lab> a sht:ValidationFailure ;
     mf:name "1val1LANGTAG_Lab" ;
     sht:trait sht:LanguageTagEquivalence ;
@@ -4711,6 +4731,19 @@
     ] ;
     .
 
+<#1val1LANGTAG_LabLTEN> a sht:ValidationFailure ;
+    mf:name "1val1LANGTAG_LabLTEN" ;
+    sht:trait sht:LanguageCase ;
+    rdfs:comment "<S> { <p1> ['ab'@en-fr] } on { <s1> <p1> 'ab'@EN }" ;
+    mf:status mf:proposed ;
+    mf:action [
+      sht:schema <../schemas/1val1LANGTAG.shex> ;
+      sht:shape <http://a.example/S1> ;
+      sht:data <Is1_Ip1_LabLTUEN.ttl> ;
+      sht:focus <http://a.example/s1>
+    ] ;
+    .
+
 <#1val1LANGTAG_LabLTen-fr-jura> a sht:ValidationFailure ;
     mf:name "1val1LANGTAG_LabLTen-fr-jura" ;
     sht:trait sht:LanguageTagEquivalence ;
@@ -4724,6 +4757,19 @@
     ] ;
     .
 
+<#1val1LANGTAG_LabLTEN-FR-JURA> a sht:ValidationFailure ;
+    mf:name "1val1LANGTAG_LabLTEN-FR-JURA" ;
+    sht:trait sht:LanguageCase ;
+    rdfs:comment "<S> { <p1> ['ab'@en-fr] } on { <s1> <p1> 'ab'@EN-FR-JURA }" ;
+    mf:status mf:proposed ;
+    mf:action [
+      sht:schema <../schemas/1val1LANGTAG.shex> ;
+      sht:shape <http://a.example/S1> ;
+      sht:data <Is1_Ip1_LabLTUEN-UFR-UJURA.ttl> ;
+      sht:focus <http://a.example/s1>
+    ] ;
+    .
+
 <#1val1LANGTAG_LaLTen-fr> a sht:ValidationFailure ;
     mf:name "1val1LANGTAG_LaLTen-fr" ;
     sht:trait sht:LanguageTagEquivalence ;
@@ -11374,6 +11420,19 @@
     ]
     .
 
+<#1val1languageStemMinuslanguage3_passLAtFR> a sht:ValidationTest ;
+    mf:name "1val1languageStemMinuslanguage3_passLAtFR" ;
+    sht:trait sht:ValueSet, sht:Stem, sht:LanguageCase ;
+    rdfs:comment "<S> { <p1> [@fr-@fr-be-@fr-cd-@fr-ch] } on { <s1> <p1> 'septante'@FR }" ;
+    mf:status mf:proposed ;
+    mf:action [
+      sht:schema <../schemas/1val1languageStemMinuslanguage3.shex> ;
+      sht:shape <http://a.example/S1> ;
+      sht:data <Is1_Ip1_LAtUFR.ttl> ;
+      sht:focus <http://a.example/s1>
+    ]
+    .
+
 <#1val1languageStemMinuslanguage3_passLAtfr-FR> a sht:ValidationTest ;
     mf:name "1val1languageStemMinuslanguage3_passLAtfr-FR" ;
     sht:trait sht:ValueSet , sht:Stem ;
@@ -11478,6 +11537,19 @@
     ]
     .
 
+<#1val1languageStemMinuslanguageStem3_passLAtFR> a sht:ValidationTest ;
+    mf:name "1val1languageStemMinuslanguageStem3_passLAtFR" ;
+    sht:trait sht:ValueSet, sht:Stem, sht:LanguageCase ;
+    rdfs:comment "<S> { <p1> [@fr~-@fr-be~-@fr-cd~-@fr-ch] } on { <s1> <p1> 'septante'@FR }" ;
+    mf:status mf:proposed ;
+    mf:action [
+      sht:schema <../schemas/1val1languageStemMinuslanguageStem3.shex> ;
+      sht:shape <http://a.example/S1> ;
+      sht:data <Is1_Ip1_LAtUFR.ttl> ;
+      sht:focus <http://a.example/s1>
+    ]
+    .
+
 <#1val1languageStemMinuslanguageStem3_LAtfrc> a sht:ValidationFailure ;
     mf:name "1val1languageStemMinuslanguageStem3_LAtfrc" ;
     sht:trait sht:ValueSet , sht:Stem ;