Unmarshal namespaced XML tags - Golang

I'm trying to extract metadata from an .odt document.

The file containing XML is called meta.xml

It has this structure:

<?xml version="1.0" encoding="UTF-8"?>
<office:document-meta xmlns:office="urn:oasis:names:tc:opendocument:xmlns:office:1.0"  xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:meta="urn:oasis:names:tc:opendocument:xmlns:meta:1.0" office:version="1.2">
    <office:meta>
        <meta:creation-date>2016-10-18T15:05:19.137453293</meta:creation-date>
        <dc:title>Document</dc:title>
        <dc:date>2017-01-17T00:59:04.731054728</dc:date>
        <meta:document-statistic meta:page-count="1" meta:word-count="0" meta:character-count="0"/>
    </office:meta>
</office:document-meta>

I'm using xml.Unmarshal() from the encoding/xml package to parse the XML and place the values inside struct fields.

This is the struct I'm using:

type Query struct {
	CreationDate string `xml:""`
    PageCount int `xml:""`
	WordCount int `xml:""`
	CharCount int `xml:""`
}

What I understood from the available documentation is that I can use field tags of type xml:"tag-name" to get the value of the XML tag, and xml:name,attr to get the attribute value.

However, since the XML file has namespaced tags (e.g. meta:creation-date) everything I've tried so far leaves the struct fields empty. Although, I might be doing something wrong.

This is the entire program inside Go playground:
https://play.golang.org/p/n7C50l1gsV

You will find that things go more smoothly if your structs map fairly directly to the XML. This code should get you started:

package main

import (
	"encoding/xml"
	"fmt"
)

type Stats struct {
	XMLName   xml.Name
	PageCount int `xml:"page-count,attr"`
}

type Meta struct {
	XMLName xml.Name
	Date    string `xml:"creation-date"`
	Title   string `xml:"title"`
	Stats   Stats  `xml:"document-statistic"`
}

type DocumentMeta struct {
	XMLName xml.Name
	Meta    Meta `xml:"meta"`
}

var data = []byte(`<?xml version="1.0" encoding="UTF-8"?>
<office:document-meta>
    <office:meta>
        <meta:creation-date>2016-10-18T15:05:19.137453293</meta:creation-date>
        <dc:title>Document</dc:title>
        <dc:date>2017-01-17T00:59:04.731054728</dc:date>
        <meta:document-statistic meta:page-count="1" meta:word-count="0" meta:character-count="0"/>
    </office:meta>
</office:document-meta>`)

func main() {
	var dm DocumentMeta
	xml.Unmarshal(data, &dm)
	fmt.Println(dm)
}