diff --git a/package-lock.json b/package-lock.json
index 3d69bf4..6d15a8a 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -10,8 +10,8 @@
       "dependencies": {
         "@abaplint/cli": "^2.119.12",
         "@abaplint/database-sqlite": "^2.11.78",
-        "@abaplint/runtime": "^2.13.19",
-        "@abaplint/transpiler-cli": "^2.13.19"
+        "@abaplint/runtime": "^2.13.20",
+        "@abaplint/transpiler-cli": "^2.13.20"
       }
     },
     "node_modules/@abaplint/cli": {
@@ -39,9 +39,9 @@
       }
     },
     "node_modules/@abaplint/runtime": {
-      "version": "2.13.19",
-      "resolved": "https://registry.npmjs.org/@abaplint/runtime/-/runtime-2.13.19.tgz",
-      "integrity": "sha512-xbMCk87GhHzF20eJkAfp8L9oLpfZTh9btdpao7pPLx56iq8d98SaWEucBcaAe87uMd9DxVpkFv9MFsN4g+au/Q==",
+      "version": "2.13.20",
+      "resolved": "https://registry.npmjs.org/@abaplint/runtime/-/runtime-2.13.20.tgz",
+      "integrity": "sha512-eqIeU1/ap6cTeTpIepld7T5irgwuqI07tNSPCP6uwwOsCrm/dCCbgCPIgMyWLXcpdhnjQEk8jM/CZ0OsKlcdNQ==",
       "license": "MIT",
       "dependencies": {
         "temporal-polyfill": "^0.3.2"
@@ -51,9 +51,9 @@
       }
     },
     "node_modules/@abaplint/transpiler-cli": {
-      "version": "2.13.19",
-      "resolved": "https://registry.npmjs.org/@abaplint/transpiler-cli/-/transpiler-cli-2.13.19.tgz",
-      "integrity": "sha512-QIkvoOfEtE+OWikYxwHg1fDKt3pOPIMDSqxC0T9gYZ1Vch7bCpYlo67c3grjV+N7wwlhm15Gh6G5Ty83PG85dw==",
+      "version": "2.13.20",
+      "resolved": "https://registry.npmjs.org/@abaplint/transpiler-cli/-/transpiler-cli-2.13.20.tgz",
+      "integrity": "sha512-kD+4svFhZpvenGVUSQ0z2DWQbK8l91TkmzLWBR9iinZNuOdlGj+nzSqEKXJ0/vEvW8sD0bj/8WsI3dl46XcwPQ==",
       "license": "MIT",
       "bin": {
         "abap_transpile": "abap_transpile"
diff --git a/package.json b/package.json
index 10f2958..19221bb 100644
--- a/package.json
+++ b/package.json
@@ -12,8 +12,8 @@
   "license": "",
   "dependencies": {
     "@abaplint/cli": "^2.119.12",
-    "@abaplint/runtime": "^2.13.19",
+    "@abaplint/runtime": "^2.13.20",
     "@abaplint/database-sqlite": "^2.11.78",
-    "@abaplint/transpiler-cli": "^2.13.19"
+    "@abaplint/transpiler-cli": "^2.13.20"
   }
 }
diff --git a/src/cl_proxy_basis.clas.abap b/src/cl_proxy_basis.clas.abap
new file mode 100644
index 0000000..b9cd0ff
--- /dev/null
+++ b/src/cl_proxy_basis.clas.abap
@@ -0,0 +1,16 @@
+CLASS cl_proxy_basis DEFINITION PUBLIC.
+  PUBLIC SECTION.
+
+    INTERFACES if_proxy_basis.
+
+    ALIASES get_protocol FOR if_proxy_basis~get_protocol.
+
+ENDCLASS.
+
+CLASS cl_proxy_basis IMPLEMENTATION.
+
+  METHOD if_proxy_basis~get_protocol.
+    RETURN. " todo, implement method
+  ENDMETHOD.
+
+ENDCLASS.
\ No newline at end of file
diff --git a/src/cl_proxy_client.clas.abap b/src/cl_proxy_client.clas.abap
index c48a735..c1c3ddf 100644
--- a/src/cl_proxy_client.clas.abap
+++ b/src/cl_proxy_client.clas.abap
@@ -1,4 +1,4 @@
-CLASS cl_proxy_client DEFINITION PUBLIC.
+CLASS cl_proxy_client DEFINITION PUBLIC INHERITING FROM cl_proxy_basis.
   PUBLIC SECTION.
     INTERFACES if_proxy_client.
 
@@ -10,13 +10,6 @@ CLASS cl_proxy_client DEFINITION PUBLIC.
       RAISING
         cx_ai_system_fault.
 
-    METHODS get_protocol
-      IMPORTING
-        protocol_name   TYPE string
-      RETURNING
-        VALUE(protocol) TYPE REF TO if_wsprotocol
-      RAISING
-        cx_ai_system_fault.
 ENDCLASS.
 
 CLASS cl_proxy_client IMPLEMENTATION.
@@ -29,8 +22,4 @@ CLASS cl_proxy_client IMPLEMENTATION.
     RETURN.
   ENDMETHOD.
 
-  METHOD get_protocol.
-    RETURN.
-  ENDMETHOD.
-
 ENDCLASS.
\ No newline at end of file
diff --git a/src/cl_proxy_client.clas.xml b/src/cl_proxy_client.clas.xml
deleted file mode 100644
index a4aa869..0000000
--- a/src/cl_proxy_client.clas.xml
+++ /dev/null
@@ -1,16 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<abapGit version="v1.0.0" serializer="LCL_OBJECT_CLAS" serializer_version="v1.0.0">
- <asx:abap xmlns:asx="http://www.sap.com/abapxml" version="1.0">
-  <asx:values>
-   <VSEOCLASS>
-    <CLSNAME>CL_PROXY_CLIENT</CLSNAME>
-    <LANGU>E</LANGU>
-    <DESCRIPT>CL_PROXY_CLIENT</DESCRIPT>
-    <STATE>1</STATE>
-    <CLSCCINCL>X</CLSCCINCL>
-    <FIXPT>X</FIXPT>
-    <UNICODE>X</UNICODE>
-   </VSEOCLASS>
-  </asx:values>
- </asx:abap>
-</abapGit>
\ No newline at end of file
diff --git a/src/if_proxy_basis.intf.abap b/src/if_proxy_basis.intf.abap
new file mode 100644
index 0000000..28b26c4
--- /dev/null
+++ b/src/if_proxy_basis.intf.abap
@@ -0,0 +1,11 @@
+INTERFACE if_proxy_basis PUBLIC.
+
+  METHODS get_protocol
+    IMPORTING
+      protocol_name   TYPE string
+    RETURNING
+      VALUE(protocol) TYPE REF TO if_wsprotocol
+    RAISING
+      cx_ai_system_fault.
+
+ENDINTERFACE.
\ No newline at end of file
diff --git a/src/if_proxy_client.intf.xml b/src/if_proxy_client.intf.xml
deleted file mode 100644
index 3b4e035..0000000
--- a/src/if_proxy_client.intf.xml
+++ /dev/null
@@ -1,15 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<abapGit version="v1.0.0" serializer="LCL_OBJECT_INTF" serializer_version="v1.0.0">
- <asx:abap xmlns:asx="http://www.sap.com/abapxml" version="1.0">
-  <asx:values>
-   <VSEOINTERF>
-    <CLSNAME>IF_PROXY_CLIENT</CLSNAME>
-    <LANGU>E</LANGU>
-    <DESCRIPT>IF_PROXY_CLIENT</DESCRIPT>
-    <EXPOSURE>2</EXPOSURE>
-    <STATE>1</STATE>
-    <UNICODE>X</UNICODE>
-   </VSEOINTERF>
-  </asx:values>
- </asx:abap>
-</abapGit>
\ No newline at end of file
diff --git a/src/if_wsprotocol.intf.xml b/src/if_wsprotocol.intf.xml
deleted file mode 100644
index 6a9b0fc..0000000
--- a/src/if_wsprotocol.intf.xml
+++ /dev/null
@@ -1,15 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<abapGit version="v1.0.0" serializer="LCL_OBJECT_INTF" serializer_version="v1.0.0">
- <asx:abap xmlns:asx="http://www.sap.com/abapxml" version="1.0">
-  <asx:values>
-   <VSEOINTERF>
-    <CLSNAME>IF_WSPROTOCOL</CLSNAME>
-    <LANGU>E</LANGU>
-    <DESCRIPT>IF_WSPROTOCOL</DESCRIPT>
-    <EXPOSURE>2</EXPOSURE>
-    <STATE>1</STATE>
-    <UNICODE>X</UNICODE>
-   </VSEOINTERF>
-  </asx:values>
- </asx:abap>
-</abapGit>
\ No newline at end of file