refactor(parser): remove dead namespaced find in parse_invoke

The `child.find("{http://www.w3.org/2005/07/scxml}scxml")` call was
unreachable because `strip_namespaces()` always runs before
`parse_invoke()`. Replaced with direct `child.find("scxml")`.

Also added a test for unknown child elements inside `<invoke>`.

Author: fgmacedo

statemachine/io/scxml/parser.py

@@ -442,10 +442,8 @@ def parse_invoke(element: ET.Element) -> InvokeDefinition:
             location = child.attrib.get("location")
             params.append(Param(name=name, expr=expr, location=location))
         elif child.tag == "content":
-            # Check for inline <scxml> element
-            scxml_child = child.find("{http://www.w3.org/2005/07/scxml}scxml")
-            if scxml_child is None:
-                scxml_child = child.find("scxml")
+            # Check for inline <scxml> element (namespaces already stripped)
+            scxml_child = child.find("scxml")
             if scxml_child is not None:
                 # Serialize the inline SCXML back to string for later parsing
                 content = ET.tostring(scxml_child, encoding="unicode")

tests/test_scxml_units.py

@@ -899,6 +899,22 @@ def test_invoke_with_inline_scxml_no_namespace(self):
         invoke_def = definition.states["s1"].invocations[0]
         assert "<final" in invoke_def.content
 
+    def test_invoke_with_unknown_child_element(self):
+        """Unknown child elements inside <invoke> are silently ignored."""
+        scxml = """
+        <scxml xmlns="http://www.w3.org/2005/07/scxml" initial="s1">
+          <state id="s1">
+            <invoke type="http://www.w3.org/TR/scxml/">
+              <param name="x" expr="1"/>
+              <unknownElement/>
+            </invoke>
+          </state>
+        </scxml>
+        """
+        definition = parse_scxml(scxml)
+        invoke_def = definition.states["s1"].invocations[0]
+        assert len(invoke_def.params) == 1
+
     def test_invoke_with_empty_content(self):
         """<invoke> with empty <content/> results in content=None."""
         scxml = """