diff --git a/dsl-reference.md b/dsl-reference.md
index f9647fce..fb710ff8 100644
--- a/dsl-reference.md
+++ b/dsl-reference.md
@@ -149,14 +149,14 @@ use:
         call: http
         with:
           method: post
-          uri: https://fake.log.collector.com
+          endpoint: https://fake.log.collector.com
           body:
             message: "${ \"Executing task '\($task.reference)'...\" }"
       after:
         call: http
         with:
           method: post
-          uri: https://fake.log.collector.com
+          endpoint: https://fake.log.collector.com
           body:
             message: "${ \"Executed task '\($task.reference)'...\" }"
   functions:
@@ -259,7 +259,7 @@ do:
     call: http
     with:
       method: get
-      uri: https://petstore.swagger.io/v2/pet/{petId}
+      endpoint: https://petstore.swagger.io/v2/pet/{petId}
 ```
 
 Serverless Workflow defines several default functions that **MUST** be supported by all implementations and runtimes:
@@ -371,7 +371,7 @@ do:
     call: http
     with:
       method: get
-      uri: https://petstore.swagger.io/v2/pet/{petId}
+      endpoint: https://petstore.swagger.io/v2/pet/{petId}
 ```
 
 ##### OpenAPI Call
@@ -483,7 +483,7 @@ do:
           call: http
           with:
             method: put
-            uri: https://fake-hospital.com/api/v3/alert/nurses
+            endpoint: https://fake-hospital.com/api/v3/alert/nurses
             body:
               patientId: ${ .patient.fullName }
               room: ${ .room.number }
@@ -491,7 +491,7 @@ do:
           call: http
           with:
             method: put
-            uri: https://fake-hospital.com/api/v3/alert/doctor
+            endpoint: https://fake-hospital.com/api/v3/alert/doctor
             body:
               patientId: ${ .patient.fullName }
               room: ${ .room.number }
@@ -918,7 +918,7 @@ do:
       call: http
       with:
         method: get
-        uri: https://
+        endpoint: https://
     catch:
       errors:
         with:
@@ -1203,14 +1203,14 @@ use:
         call: http
         with:
           method: post
-          uri: https://fake.log.collector.com
+          endpoint: https://fake.log.collector.com
           body:
             message: "${ \"Executing task '\($task.reference)'...\" }"
       after:
         call: http
         with:
           method: post
-          uri: https://fake.log.collector.com
+          endpoint: https://fake.log.collector.com
           body:
             message: "${ \"Executed task '\($task.reference)'...\" }"
 do:
@@ -1218,7 +1218,7 @@ do:
     call: http
     with:
       method: get
-      uri: https://fake.com/sample
+      endpoint: https://fake.com/sample
 ```
 
 _Intercept HTTP calls to 'https://mocked.service.com' and mock its response:_
@@ -1248,7 +1248,7 @@ do:
     call: http
     with:
       method: get
-      uri: https://fake.com/sample
+      endpoint: https://fake.com/sample
 ```
 
 ### Error
diff --git a/examples/asyncapi.yaml b/examples/asyncapi.yaml
new file mode 100644
index 00000000..9d442d08
--- /dev/null
+++ b/examples/asyncapi.yaml
@@ -0,0 +1,20 @@
+document:
+  dsl: 1.0.0-alpha1
+  namespace: examples
+  name: bearer-auth
+  version: 1.0.0-alpha1
+do:
+  greetUser:
+    call: asyncapi
+    with:
+      document:
+        uri: https://fake.com/docs/asyncapi.json
+      operationRef: findPetsByStatus
+      server: staging
+      message: getPetByStatusQuery
+      binding: http
+      payload:
+        petId: ${ .pet.id }
+      authentication:
+        bearer:
+          token: ${ .token }
diff --git a/examples/call-http-shorthand-endpoint.yaml b/examples/call-http-shorthand-endpoint.yaml
new file mode 100644
index 00000000..f682ed30
--- /dev/null
+++ b/examples/call-http-shorthand-endpoint.yaml
@@ -0,0 +1,11 @@
+document:
+  dsl: 1.0.0-alpha1
+  namespace: examples
+  name: call-http-shorthand-endpoint
+  version: 1.0.0-alpha1
+do:
+  getPetById:
+    call: http
+    with:
+      method: get
+      endpoint: https://petstore.swagger.io/v2/pet/{petId}
diff --git a/examples/use-authentication.yaml b/examples/use-authentication.yaml
new file mode 100644
index 00000000..c8cd34fe
--- /dev/null
+++ b/examples/use-authentication.yaml
@@ -0,0 +1,18 @@
+document:
+  dsl: 1.0.0-alpha1
+  namespace: examples
+  name: bearer-auth
+  version: 1.0.0-alpha1
+use:
+  authentications:
+    petStoreAuth:
+      bearer:
+        token: ${ .token }
+do:
+  getPetById:
+    call: http
+    with:
+      method: get
+      endpoint:
+        uri: https://petstore.swagger.io/v2/pet/{petId}
+        authentication: petStoreAuth
diff --git a/schema/workflow.yaml b/schema/workflow.yaml
index f27302fa..f7892b38 100644
--- a/schema/workflow.yaml
+++ b/schema/workflow.yaml
@@ -141,7 +141,7 @@ $defs:
       - properties:
           call:
             type: string
-            constant: asyncapi
+            const: asyncapi
           with:
             type: object
             properties:
@@ -173,17 +173,19 @@ $defs:
                 description: |
                   The payload to call the AsyncAPI operation with, if any.
               authentication:
-                ref: "#/$defs/authenticationPolicy"
                 description: |
                   The authentication policy, if any, to use when calling the
                   AsyncAPI operation.
+                oneOf:
+                  - $ref: "#/$defs/authenticationPolicy"
+                  - type: string
             required: [document, operationRef]
             description: Defines the AsyncAPI call to perform.
         required: [call, with]
       - properties:
           call:
             type: string
-            constant: grpc
+            const: grpc
           with:
             type: object
             properties:
@@ -207,7 +209,9 @@ $defs:
                     max: 65535
                     description: The port number of the GRPC service to call.
                   authentication:
-                    $ref: "#/$defs/authenticationPolicy"
+                    oneOf:
+                      - $ref: "#/$defs/authenticationPolicy"
+                      - type: string
                     description: The endpoint's authentication policy, if any.
                 required: [name, host]
               method:
@@ -224,7 +228,7 @@ $defs:
       - properties:
           call:
             type: string
-            constant: http
+            const: http
           with:
             type: object
             properties:
@@ -232,8 +236,11 @@ $defs:
                 type: string
                 description: The HTTP method of the HTTP request to perform.
               endpoint:
-                $ref: "#/$defs/endpoint"
                 description: The HTTP endpoint to send the request to.
+                oneOf:
+                  - $ref: "#/$defs/endpoint"
+                  - type: string
+                    format: uri-template
               headers:
                 type: object
                 description: |
@@ -251,7 +258,7 @@ $defs:
       - properties:
           call:
             type: string
-            constant: openapi
+            const: openapi
           with:
             type: object
             properties:
@@ -269,7 +276,9 @@ $defs:
                   A name/value mapping of the parameters of the OpenAPI
                   operation to call.
               authentication:
-                $ref: "#/$defs/authenticationPolicy"
+                oneOf:
+                  - $ref: "#/$defs/authenticationPolicy"
+                  - type: string
                 description: |
                   The authentication policy, if any, to use when calling the
                   OpenAPI operation.
@@ -294,6 +303,7 @@ $defs:
               function with.
         required: [call]
   compositeTask:
+    type: object
     properties:
       execute:
         type: object
@@ -331,6 +341,7 @@ $defs:
       seamless integration and execution of multiple subtasks to accomplish
       complex operations
   emitTask:
+    type: object
     properties:
       emit:
         type: object
@@ -380,6 +391,7 @@ $defs:
         default: continue
       - type: string
   forTask:
+    type: object
     properties:
       for:
         type: object
@@ -787,8 +799,10 @@ $defs:
         format: uri-template
         description: The endpoint's URI.
       authentication:
-        $ref: "#/$defs/authenticationPolicy"
         description: The authentication policy to use.
+        oneOf:
+          - $ref: "#/$defs/authenticationPolicy"
+          - type: string
     required: [uri]
   eventConsumptionStrategy:
     type: object
@@ -916,8 +930,10 @@ $defs:
         format: uri
         description: The endpoint's URI.
       authentication:
-        $ref: "#/$defs/authenticationPolicy"
         description: The authentication policy to use.
+        oneOf:
+          - $ref: "#/$defs/authenticationPolicy"
+          - type: string
       name:
         type: string
         description: The external resource's name, if any.