Add action container structs with descriptor methods.

v2alpha/soap/soap.go

@@ -0,0 +1,15 @@
+// Package soap defines basic types used by SOAP packages.
+package soap
+
+// SOAPAction defines the interface for the convenience self-describing action request/response
+// struct types.
+type SOAPAction interface {
+	// ServiceType returns Service type, e.g. "urn:schemas-upnp-org:service:Foo:1".
+	ServiceType() string
+	// ActionName returns Action name, e.g. "SetBar".
+	ActionName() string
+	// RefRequest returns reference to the action request member.
+	RefRequest() any
+	// RefResponse returns reference to the action response member.
+	RefResponse() any
+}