diff --git a/examples/call-http-query-parameters.yaml b/examples/call-http-query-parameters.yaml
index 6f34c67e..f17d3043 100644
--- a/examples/call-http-query-parameters.yaml
+++ b/examples/call-http-query-parameters.yaml
@@ -1,4 +1,4 @@
-# yaml-language-server: $schema=https://serverlessworkflow.io/schemas/1.0.0-alpha2/workflow.yaml
+# yaml-language-server: $schema=../schema/workflow.yaml
 document:
   dsl: 1.0.0-alpha2
   namespace: examples
diff --git a/examples/star-wars-homeworld.yaml b/examples/star-wars-homeworld.yaml
index c443feb0..103f1838 100644
--- a/examples/star-wars-homeworld.yaml
+++ b/examples/star-wars-homeworld.yaml
@@ -1,4 +1,4 @@
-# yaml-language-server: $schema=https://serverlessworkflow.io/schemas/1.0.0-alpha2/workflow.yaml
+# yaml-language-server: $schema=../schema/workflow.yaml
 document:
   dsl: 1.0.0-alpha2
   namespace: examples
diff --git a/schema/workflow.yaml b/schema/workflow.yaml
index 7162014e..66d89ce6 100644
--- a/schema/workflow.yaml
+++ b/schema/workflow.yaml
@@ -979,8 +979,7 @@ $defs:
     description: Inline configuration of the OAuth2 authentication policy.
     properties:
       authority:
-        type: string
-        format: uri-template
+        $ref: '#/$defs/uriTemplate'
         title: OAuth2AutenthicationDataAuthority
         description: The URI that references the OAuth2 authority to use.
       grant:
@@ -1114,11 +1113,10 @@ $defs:
         description: A URI reference that identifies the error type.
         oneOf:
           - title: LiteralErrorType
+            $ref: '#/$defs/uriTemplate'
             description: The literal error type.
-            type: string
-            format: uri-template
-          - $ref: '#/$defs/runtimeExpression'
-            title: ExpressionErrorType
+          - title: ExpressionErrorType
+            $ref: '#/$defs/runtimeExpression'
             description: An expression based error type.
       status:
         type: integer
@@ -1144,14 +1142,23 @@ $defs:
         title: ErrorDetails
         description: A human-readable explanation specific to this occurrence of the error.
     required: [ type, status ]
+  uriTemplate:
+    title: UriTemplate
+    anyOf:
+      - title: LiteralUriTemplate
+        type: string
+        format: uri-template
+        pattern: "^[A-Za-z][A-Za-z0-9+\\-.]*://.*"
+      - title: LiteralUri
+        type: string
+        format: uri
+        pattern: "^[A-Za-z][A-Za-z0-9+\\-.]*://.*"
   endpoint:
     title: Endpoint
     description: Represents an endpoint.
     oneOf:
       - $ref: '#/$defs/runtimeExpression'
-      - title: LiteralEndpoint
-        type: string
-        format: uri-template
+      - $ref: '#/$defs/uriTemplate'
       - title: EndpointConfiguration
         type: object
         unevaluatedProperties: false
@@ -1162,10 +1169,9 @@ $defs:
             oneOf:
               - title: LiteralEndpointURI
                 description: The literal endpoint's URI.
-                type: string
-                format: uri-template
-              - $ref: '#/$defs/runtimeExpression'
-                title: ExpressionEndpointURI
+                $ref: '#/$defs/uriTemplate'
+              - title: ExpressionEndpointURI
+                $ref: '#/$defs/runtimeExpression'
                 description: An expression based endpoint's URI.
           authentication:
             $ref: '#/$defs/referenceableAuthenticationPolicy'
@@ -1185,9 +1191,7 @@ $defs:
         title: EventSource
         description: Identifies the context in which an event happened.
         oneOf:
-          - title: LiteralSource
-            type: string
-            format: uri-template
+          - $ref: '#/$defs/uriTemplate'
           - $ref: '#/$defs/runtimeExpression'
       type:
         type: string
@@ -1214,11 +1218,10 @@ $defs:
         description: The schema describing the event format.
         oneOf:
           - title: LiteralDataSchema
+            $ref: '#/$defs/uriTemplate'
             description: The literal event data schema.
-            type: string
-            format: uri-template
-          - $ref: '#/$defs/runtimeExpression'
-            title: ExpressionDataSchema
+          - title: ExpressionDataSchema
+            $ref: '#/$defs/runtimeExpression'
             description: An expression based event data schema.
     additionalProperties: true
   eventConsumptionStrategy: