fix(XMLAdapter): Implement user message formatting

dspy/adapters/xml_adapter.py

@@ -41,6 +41,31 @@ def format_signature_fields_for_instructions(fields: dict[str, FieldInfo]):
         parts.append(format_signature_fields_for_instructions(signature.output_fields))
         return "\n\n".join(parts).strip()
 
+    def format_user_message_content(
+        self,
+        signature: type[Signature],
+        inputs: dict[str, Any],
+        prefix: str = "",
+        suffix: str = "",
+        main_request: bool = False,
+    ) -> str:
+        messages = [prefix]
+
+        messages.append(self.format_field_with_value(
+            {
+                FieldInfoWithName(name=k, info=v): inputs.get(k)
+                for k, v in signature.input_fields.items() if k in inputs
+            },
+        ))
+
+        if main_request:
+            output_requirements = self.user_message_output_requirements(signature)
+            if output_requirements is not None:
+                messages.append(output_requirements)
+
+        messages.append(suffix)
+        return "\n\n".join(messages).strip()
+
     def format_assistant_message_content(
         self,
         signature: type[Signature],

tests/adapters/test_xml_adapter.py

@@ -291,7 +291,7 @@ class QA(dspy.Signature):
     )
 
     expected_user = (
-        "[[ ## query ## ]]\nwhen was Marie Curie born\n\n"
+        "<query>\nwhen was Marie Curie born\n</query>\n\n"
         "Respond with the corresponding output fields wrapped in XML tags `<answer>`."
     )