diff --git a/protocols/osi3/ipv4.yml b/protocols/osi3/ipv4.yml
index 722d53b..3449b17 100644
--- a/protocols/osi3/ipv4.yml
+++ b/protocols/osi3/ipv4.yml
@@ -1,7 +1,7 @@
 ---
 protocol:
-  name: internet protocol version 4
-  shortname: ipv4
+  name: ipv4
+  longname: internet protocol version 4
   osilayer: 3
   fields:
     - field: version
@@ -67,8 +67,5 @@ protocol:
       optional: yes
     - field: data
       data: true
-  nextlayer:
-    - { protocol: tcp, identifier: 6 }
-    - { protocol: udp, identifier: 17 }
     
     
\ No newline at end of file
diff --git a/protocols/osi3/ipv6.yml b/protocols/osi3/ipv6.yml
index 46b2296..de2a217 100644
--- a/protocols/osi3/ipv6.yml
+++ b/protocols/osi3/ipv6.yml
@@ -30,16 +30,6 @@ protocol:
     - field: dstaddress
       desc: destination address
       length: 16
-  nextlayer:
-    - { protocol: hopbyhop, identifier: 0, extension: yes }
-    - { protocol: destoptions, identifier: 60, extension: yes }
-    - { protocol: routing, identifier: 43, extension: yes }
-    - { protocol: fragment, identifier: 44, extension: yes }
-    - { protocol: ipsec_ah, identifier: 51 }
-    - { protocol: ipsec_esp, identifier: 50 }
-    - { protocol: mobility, identifier: 135, extension: yes }
-    - { protocol: tcp, identifier: 6 }
-    - { protocol: udp, identifier: 17 }
   extensionreferencefield: nextheader
   extensions:
     - extension:
diff --git a/protocols/osi4/udp.yml b/protocols/osi4/udp.yml
index dffcdeb..98745e8 100644
--- a/protocols/osi4/udp.yml
+++ b/protocols/osi4/udp.yml
@@ -1,7 +1,7 @@
 ---
 protocol:
   name: udp
-  shortname: udp
+  longname: udp
   osilayer: 4
   fields:
     - field: srcport
diff --git a/protocols/transitionids2.yml b/protocols/transitionids2.yml
new file mode 100644
index 0000000..666c354
--- /dev/null
+++ b/protocols/transitionids2.yml
@@ -0,0 +1,9 @@
+---
+layertransition:
+  layers: { from: 2, to: 3 }
+  protocols: 
+    - eth-frame
+  nextlayer:
+    - { idhex: 0x0800, protocol: ipv4 }
+    - { idhex: 0x0806, protocol: arp }
+    
\ No newline at end of file
diff --git a/protocols/transitionids3.yml b/protocols/transitionids3.yml
new file mode 100644
index 0000000..257701a
--- /dev/null
+++ b/protocols/transitionids3.yml
@@ -0,0 +1,12 @@
+---
+layertransition:
+  layers: { from: 3, to: 4 }
+  protocols: 
+    - ipv4
+    - ipv6
+  nextlayer:
+    - { idhex: 0x11, protocol: udp }
+    - { idhex: 0x06, protocol: tcp }
+    - { idhex: 0x32, protocol: ipsec_esp }
+    - { idhex: 0x33, protocol: ipsec_ah }
+    
\ No newline at end of file
diff --git a/structure-schema.yml b/structure-schema.yml
index ae06650..cea0576 100644
--- a/structure-schema.yml
+++ b/structure-schema.yml
@@ -7,7 +7,7 @@ mapping:
       "name": 
         type: str
         required: yes
-      "shortname": 
+      "longname": 
         type: str
       "fields": 
         type: seq
@@ -41,19 +41,6 @@ mapping:
         type: int 
         range: { max: 7, min: 1 }
         required: yes
-      "nextlayer": #identifier list for next layer protocols
-        type: seq
-        sequence:
-          - type: map
-            mapping:
-              "protocol": 
-                type: str
-                required: yes
-              "identifier":
-                type: int
-                required: yes
-              "extension": 
-                type: bool
       "extensionreferencefield":
         type: str
       "extensions": 
@@ -95,7 +82,6 @@ mapping:
                   "desc":   # description 
                     type: str
                     required: yes
-                    
 ... #kwalify needs this, or it goes crazy validating, but only when there are comments beneath
 
 
diff --git a/transition-schema.yml b/transition-schema.yml
new file mode 100644
index 0000000..8abfe21
--- /dev/null
+++ b/transition-schema.yml
@@ -0,0 +1,37 @@
+type: map
+mapping: 
+  "layertransition": #layer transition ids
+    type: map
+    required: yes
+    mapping:
+      "layers": # which layers?
+        type: map
+        required: yes
+        mapping: 
+          "from":
+            type: int
+            required: yes
+          "to":
+            type: int
+            required: yes
+      "protocols": # which protocols support these ids?
+        required: yes
+        type: seq
+        sequence:
+          - type: str
+            required: yes
+      "nextlayer": # list of ids with protocol name (reference name!)
+        type: seq
+        required: yes
+        sequence:
+          - type: map
+            mapping:
+              "idhex": 
+                type: str
+                required: yes
+              "protocol": 
+                type: str
+                required: yes
+              "id":
+                type: int
+