diff --git a/yangkit-data-proto-codec/src/main/resources/convention/envelope-json-convention.yaml b/yangkit-data-proto-codec/src/main/resources/convention/envelope-json-convention.yaml
new file mode 100644
index 00000000..7152d7e0
--- /dev/null
+++ b/yangkit-data-proto-codec/src/main/resources/convention/envelope-json-convention.yaml
@@ -0,0 +1,8 @@
+convention:
+  name: "envelope"
+  description: "Envelope YANG to Protobuf mapping with JSON inner format"
+  encoding-mode: "envelope"
+envelope:
+  field-name: "data"
+  field-type: "bytes"
+  inner-format: "json"
diff --git a/yangkit-data-proto-codec/src/main/resources/convention/simple-convention.yaml b/yangkit-data-proto-codec/src/main/resources/convention/simple-convention.yaml
new file mode 100644
index 00000000..cb57b808
--- /dev/null
+++ b/yangkit-data-proto-codec/src/main/resources/convention/simple-convention.yaml
@@ -0,0 +1,8 @@
+convention:
+  name: "simple"
+  description: "Simple YANG to Protobuf mapping with primitive types and sequential field numbers"
+  encoding-mode: "structured"
+field-numbering: "sequential"
+scalar-wrapping: "none"
+bits-as: "string"
+union-as: "string"