Is using '* parent="Evolution.Util"' supposed to prevent from generating bindings that depends on the one generated with this metadata ?


I have this in a gir :
      <virtual-method name="validate" invoker="validate">
        <return-value transfer-ownership="none">
          <type name="gboolean" c:type="gboolean"/>
        </return-value>
        <parameters>
          <parameter name="alert" transfer-ownership="none">
            <type name="EvolutionUtil.Alert" c:type="EAlert**"/>
          </parameter>
        </parameters>
      </virtual-method>

This one depends ona vapi I generated via vapigen too which start with:
/* evolution-util-3.0.vapi generated by vapigen, do not modify. */

[CCode (cprefix = "E", gir_namespace = "EvolutionUtil", gir_version = "3.0", lower_case_cprefix = "e_")]
namespace Evolution {
        namespace Util {

and has:

                [CCode (cheader_filename = "e-util/e-account-utils.h,e-util/e-activity.h,e-util/e-alert-dialog.h,e-util/e-alert-sink.h,e-util/e-alert.h,e-util/e-bit-array.h,e-util/e-categories-config.h,e-util/e-charset.h,e-util/e-config.h,e-util/e-datetime-format.h,e-util/e-dialog-utils.h,e-util/e-dialog-widgets.h,e-util/e-event.h,e-util/e-extensible.h,e-util/e-extension.h,e-util/e-file-utils.h,e-util/e-html-utils.h,e-util/e-icon-factory.h,e-util/e-import.h,e-util/e-marshal.h,e-util/e-mktemp.h,e-util/e-module.h,e-util/e-plugin-ui.h,e-util/e-plugin-util.h,e-util/e-plugin.h,e-util/e-poolv.h,e-util/e-print.h,e-util/e-selection.h,e-util/e-signature-list.h,e-util/e-signature-utils.h,e-util/e-signature.h,e-util/e-sorter-array.h,e-util/e-sorter.h,e-util/e-text-event-processor-emacs-like.h,e-util/e-text-event-processor-types.h,e-util/e-text-event-processor.h,e-util/e-ui-manager.h,e-util/e-unicode.h,e-util/e-util-enums.h,e-util/e-util-enumtypes.h,e-util/e-util.h,e-util/e-xml-utils.h,e-util/gconf-bridge.h", cname = "EAlert", type_id = "e_alert_get_type ()")]
                public class Alert : GLib.Object {
                        [CCode (has_construct_function = false)]
                        protected Alert ();
                        [CCode (cname = "e_alert_add_action")]
                        public void add_action (Gtk.Action action, int response_id);
                        [CCode (cname = "e_alert_new_array", has_construct_function = false)]
                        public Alert.array (string tag, GLib.GenericArray<void*> args);
                        [CCode (cname = "e_alert_get_default_response")]
                        public int get_default_response ();
                        [CCode (cname = "e_alert_get_message_type")]
                        public Gtk.MessageType get_message_type ();
                        [CCode (cname = "e_alert_get_primary_text")]
                        public unowned string get_primary_text ();
                        [CCode (cname = "e_alert_get_secondary_text")]
                        public unowned string get_secondary_text ();
                        [CCode (cname = "e_alert_get_stock_id")]
                        public unowned string get_stock_id ();
                        [CCode (cname = "e_alert_run_dialog")]
                        public static int run_dialog (Gtk.Window parent, Evolution.Util.Alert alert);
                        [CCode (cname = "e_alert_set_default_response")]
                        public void set_default_response (int response_id);
                        [CCode (cname = "e_alert_set_message_type")]
                        public void set_message_type (Gtk.MessageType message_type);
                        [CCode (cname = "e_alert_set_primary_text")]
                        public void set_primary_text (string primary_text);
                        [CCode (cname = "e_alert_set_secondary_text")]
                        public void set_secondary_text (string secondary_text);
                        [CCode (cname = "e_alert_start_timer")]
                        public void start_timer (uint seconds);
                        [NoAccessorMethod]
                        public GLib.GenericArray<weak void*> args { owned get; construct; }
                        [NoAccessorMethod]
                        public Gtk.MessageType message_type { get; set; }
                        [NoAccessorMethod]
                        public string primary_text { owned get; set; }
                        [NoAccessorMethod]
                        public string secondary_text { owned get; set; }
                        [NoAccessorMethod]
                        public string tag { owned get; construct; }
                        [HasEmitter]
                        public virtual signal void response (int response_id);
                }

This vapi was generated with metadata:
EvolutionUtil name="Evolution"
* parent="Evolution.Util"

which is the only way I found to translate my namespace from EvolutionUtil to namespace Evolution { namespace Utl { .

Doing :
/usr/local/bin/vapigen \
	--vapidir=. \
	--girdir=../e-util \
	--library evolution-filter-3.0 \
	--metadatadir=. \
	../filter/EFilter-3.0.gir

results in:

EFilter-3.0.gir:239.69-239.69: error: The type name `Evolution.Alert' could not be found
            <type name="EvolutionUtil.Alert" c:type="EAlert**"/>
                                                                    ^
EFilter-3.0.gir:249.65-249.65: error: The type name `Xml.NodePtr' could not be found
            <type name="libxml2.NodePtr" c:type="xmlNodePtr"/>
                                                                ^
EFilter-3.0.gir:259.65-259.65: error: The type name `Xml.NodePtr' could not be found
            <type name="libxml2.NodePtr" c:type="xmlNodePtr"/>
                                                                ^
EFilter-3.0.gir:969.69-969.69: error: The type name `Evolution.Alert' could not be found
            <type name="EvolutionUtil.Alert" c:type="EAlert**"/>
                                                                    ^
EFilter-3.0.gir:979.65-979.65: error: The type name `Xml.NodePtr' could not be found
            <type name="libxml2.NodePtr" c:type="xmlNodePtr"/>
                                                                ^
EFilter-3.0.gir:992.65-992.65: error: The type name `Xml.NodePtr' could not be found
            <type name="libxml2.NodePtr" c:type="xmlNodePtr"/>
                                                                ^
EFilter-3.0.gir:1138.69-1138.69: error: The type name `Evolution.Alert' could not be found
            <type name="EvolutionUtil.Alert" c:type="EAlert**"/>
                                                                    ^
EFilter-3.0.gir:1148.65-1148.65: error: The type name `Xml.NodePtr' could not be found
            <type name="libxml2.NodePtr" c:type="xmlNodePtr"/>
                                                                ^
Generation failed: 8 error(s), 0 warning(s)


To sum up :
the ore of the issue is that I have a gir with an argument of type name="EvolutionUtil.Alert" . I have a vapi
which had namespace EvolutionUtil (this worked). I was told to use '* parent="Evolution.Util"' in the metadata to be able to have a top namespace evolution for all the evolution bindings but then vapigen complains that it cannot find "Evolution.Alert" when using vapigen against the gir which has the argument of type EvolutionUtil.Alert .

My finding seems clue me to think that vapigen properly attempt to find the Alert declaration in the vapi I generated wit the metadata '* parent="Evolution.Util'" . But then it only goes one level into the nested namespaces Evolution.Util, ie it stop at Evolution . If I hack this vapi to replace "namespace Evolution { namespace Util" by "namespace Evolution34 { namespace Util {" the error becomes :
EFilter-3.0.gir:239.69-239.69: error: The type name `Evolution34.Alert' could not be found
            <type name="EvolutionUtil.Alert" c:type="EAlert**"/>
                                                                    ^
Also If I remove the nested "namespace Util" the error vanish.

Is using '* parent="Evolution.Util"' supposed to prevent generating bindings against this vapi 


(I am on Vala 0.14.0.20-2d9c1)