Unmarshalling in Go returns a blank output

I get a blank output for the print statements below. Only for the second print statement I get the xml structure. Is the issue with my struct? I have generated the structs using Chidley (https://github.com/gnewton/chidley) .

<!-- begin snippet: js hide: false console: true babel: false -->

package main
import (
"encoding/xml"
"fmt"
"io/ioutil"
"os"
)
type Query struct {
rpc Rpc_reply `xml:"urn:ietf:params:xml:ns:netconf:base:1.0 rpc-reply,omitempty" json:"rpc-reply,omitempty"`
}
type Addr_tag_list struct {
Addr_tag Addr_tag `xml:"urn:ietf:params:xml:ns:netconf:base:1.0 addr,omitempty" json:"addr,omitempty"`
Pref_tag Pref_tag `xml:"urn:ietf:params:xml:ns:netconf:base:1.0 pref,omitempty" json:"pref,omitempty"`
Tag Tag `xml:"urn:ietf:params:xml:ns:netconf:base:1.0 tag,omitempty" json:"tag,omitempty"`
Type_tag Type_tag `xml:"urn:ietf:params:xml:ns:netconf:base:1.0 type,omitempty" json:"type,omitempty"`
VpcPeer_tag VpcPeer_tag `xml:"urn:ietf:params:xml:ns:netconf:base:1.0 vpcPeer,omitempty" json:"vpcPeer,omitempty"`
XMLName  xml.Name `xml:"urn:ietf:params:xml:ns:netconf:base:1.0 Addr-list,omitempty" json:"Addr-list,omitempty"`
}
type Dom_list struct {
If_items If_items `xml:"urn:ietf:params:xml:ns:netconf:base:1.0 if-items,omitempty" json:"if-items,omitempty"`
Name_tag Name_tag `xml:"urn:ietf:params:xml:ns:netconf:base:1.0 name,omitempty" json:"name,omitempty"`
XMLName  xml.Name `xml:"urn:ietf:params:xml:ns:netconf:base:1.0 Dom-list,omitempty" json:"Dom-list,omitempty"`
}
type If_list struct {
Addr_items_tag Addr_items_tag `xml:"urn:ietf:params:xml:ns:netconf:base:1.0 addr-items,omitempty" json:"addr-items,omitempty"`
Id_tag Id_tag `xml:"urn:ietf:params:xml:ns:netconf:base:1.0 id,omitempty" json:"id,omitempty"`
XMLName  xml.Name `xml:"urn:ietf:params:xml:ns:netconf:base:1.0 If-list,omitempty" json:"If-list,omitempty"`
}
type Systemtag struct {
Ipv4_items Ipv4_items `xml:"urn:ietf:params:xml:ns:netconf:base:1.0 ipv4-items,omitempty" json:"ipv4-items,omitempty"`
Test_name Test_name `xml:"urn:ietf:params:xml:ns:netconf:base:1.0 test-name,omitempty" json:"test-name,omitempty"`
XMLName  xml.Name `xml:"urn:ietf:params:xml:ns:netconf:base:1.0 System,omitempty" json:"System,omitempty"`
}
type Addr_tag struct {
Text string `xml:",chardata" json:",omitempty"`
XMLName  xml.Name `xml:"urn:ietf:params:xml:ns:netconf:base:1.0 addr,omitempty" json:"addr,omitempty"`
}
type Addr_items_tag struct {
Addr_tag_list Addr_tag_list `xml:"urn:ietf:params:xml:ns:netconf:base:1.0 Addr-list,omitempty" json:"Addr-list,omitempty"`
XMLName  xml.Name `xml:"urn:ietf:params:xml:ns:netconf:base:1.0 addr-items,omitempty" json:"addr-items,omitempty"`
}
type Data_tag struct {
Systemtag Systemtag `xml:"urn:ietf:params:xml:ns:netconf:base:1.0 System,omitempty" json:"System,omitempty"`
XMLName  xml.Name `xml:"urn:ietf:params:xml:ns:netconf:base:1.0 data,omitempty" json:"data,omitempty"`
}
type Dom_items struct {
Dom_list []Dom_list `xml:"urn:ietf:params:xml:ns:netconf:base:1.0 Dom-list,omitempty" json:"Dom-list,omitempty"`
XMLName  xml.Name `xml:"urn:ietf:params:xml:ns:netconf:base:1.0 dom-items,omitempty" json:"dom-items,omitempty"`
}
type Id_tag struct {
Text string `xml:",chardata" json:",omitempty"`
XMLName  xml.Name `xml:"urn:ietf:params:xml:ns:netconf:base:1.0 id,omitempty" json:"id,omitempty"`
}
type If_items struct {
If_list []If_list `xml:"urn:ietf:params:xml:ns:netconf:base:1.0 If-list,omitempty" json:"If-list,omitempty"`
XMLName  xml.Name `xml:"urn:ietf:params:xml:ns:netconf:base:1.0 if-items,omitempty" json:"if-items,omitempty"`
}
type Inst_items struct {
Dom_items Dom_items `xml:"urn:ietf:params:xml:ns:netconf:base:1.0 dom-items,omitempty" json:"dom-items,omitempty"`
XMLName  xml.Name `xml:"urn:ietf:params:xml:ns:netconf:base:1.0 inst-items,omitempty" json:"inst-items,omitempty"`
}
type Ipv4_items struct {
Inst_items Inst_items `xml:"urn:ietf:params:xml:ns:netconf:base:1.0 inst-items,omitempty" json:"inst-items,omitempty"`
XMLName  xml.Name `xml:"urn:ietf:params:xml:ns:netconf:base:1.0 ipv4-items,omitempty" json:"ipv4-items,omitempty"`
}
type Name_tag struct {
Text string `xml:",chardata" json:",omitempty"`
XMLName  xml.Name `xml:"urn:ietf:params:xml:ns:netconf:base:1.0 name,omitempty" json:"name,omitempty"`
}
type Pref_tag struct {
Text bool `xml:",chardata" json:",omitempty"`
XMLName  xml.Name `xml:"urn:ietf:params:xml:ns:netconf:base:1.0 pref,omitempty" json:"pref,omitempty"`
}
type Rpc_reply struct {
Attr_message_id string `xml:" message-id,attr"  json:",omitempty"`
Attr_xmlns string `xml:" xmlns,attr"  json:",omitempty"`
Data_tag Data_tag `xml:"urn:ietf:params:xml:ns:netconf:base:1.0 data,omitempty" json:"data,omitempty"`
XMLName  xml.Name `xml:"urn:ietf:params:xml:ns:netconf:base:1.0 rpc-reply,omitempty" json:"rpc-reply,omitempty"`
}
type Tag struct {
Text bool `xml:",chardata" json:",omitempty"`
XMLName  xml.Name `xml:"urn:ietf:params:xml:ns:netconf:base:1.0 tag,omitempty" json:"tag,omitempty"`
}
type Type_tag struct {
Text string `xml:",chardata" json:",omitempty"`
XMLName  xml.Name `xml:"urn:ietf:params:xml:ns:netconf:base:1.0 type,omitempty" json:"type,omitempty"`
}
type VpcPeer_tag struct {
Text string `xml:",chardata" json:",omitempty"`
XMLName  xml.Name `xml:"urn:ietf:params:xml:ns:netconf:base:1.0 vpcPeer,omitempty" json:"vpcPeer,omitempty"`
}
type Test_name struct {
Text string `xml:",chardata" json:",omitempty"`
XMLName  xml.Name `xml:"urn:ietf:params:xml:ns:netconf:base:1.0 test-name,omitempty" json:"test-name,omitempty"`
}
func main() {
xmlFile, err := os.Open("interface.xml")
if err != nil {
fmt.Println("Error opening file:", err)
return
}
defer xmlFile.Close()
b, _ := ioutil.ReadAll(xmlFile)
var q Query
err2 := xml.Unmarshal(b, &q)
if err2 != nil {
fmt.Printf("error: %v", err2)
return
}
fmt.Println(q)
//fmt.Printf("%#v",q)
fmt.Printf("%s",q.rpc.Attr_message_id);
}

<!-- end snippet -->

A sample of the interface.xml file is :

<!-- begin snippet: js hide: false console: true babel: false -->

<!-- language: lang-html -->

<?xml version="1.0" encoding="UTF-8"?>
<rpc-reply xmlns="urn:ietf:params:xml:ns:netconf:base:1.0" message-id="1">
<data>
<System>
<test-name>##WORK##</test-name>
<ipv4-items>
<inst-items>
<dom-items>
<Dom-list>
<name>default</name>
<if-items>
<If-list>
<id>eth5/8</id>
<addr-items>
<Addr-list>
<addr>1.1.1.1</addr>
<pref>1</pref>
<tag>0</tag>
<type>primary</type>
<vpcPeer>0.0.0.0</vpcPeer>
</Addr-list>
</addr-items>
</If-list>
</if-items>
</Dom-list>
<Dom-list>
<name>management</name>
<if-items>
<If-list>
<id>eth5/8</id>
<addr-items>
<Addr-list>
<addr>11.11.11.11</addr>
<pref>1</pref>
<tag>0</tag>
<type>primary</type>
<vpcPeer>0.0.0.0</vpcPeer>
</Addr-list>
</addr-items>
</If-list>
</if-items>
</Dom-list>
</dom-items>
</inst-items>
</ipv4-items>
</System>
</data>
</rpc-reply>

<!-- end snippet -->

You may load the xml data http://countwordsfree.com/xmlviewer to get a better view

Issue is struct you're passing doesn't have element in the XML hierarchy (XMLName xml.Name mapping).

Change these two lines to-

var rpc Rpc_reply
err2 := xml.Unmarshal(b, &rpc)