Representing/processing unstructured/general xml - go

Question

I'm about to manipulate XMLs (without schema) in Go and my goal is to achieve a simple framework without a hardwired internal representation of xml's structure.
I have a code like this:
package main
import (
"bytes"
"encoding/xml"
"io"
"io/ioutil"
"log"
"os"
)
var decoder *xml.Decoder
var encoder *xml.Encoder
type Tokens struct {
root xml.Token
children []Tokens
}
type Tokenizer interface {
toStr() string
}
func setTokens(t xml.Token) Tokens {
res := Tokens{}
res.root = t
res.children = make([]Tokens, 0)
for {
tok, err := decoder.Token()
if err == io.EOF {
break
}
t := setTokens(xml.CopyToken(tok))
res.children = append(res.children, t)
}
return res
}
func (t Tokens) toStr() {
encoder.EncodeToken(t.root)
for i := range t.children {
t.children[i].toStr()
}
}
func main() {
fc, err := ioutil.ReadFile("testXML.xml")
if err != nil {
log.Fatal(err)
return
}
out, err := os.Create("./testOut.xml")
decoder = xml.NewDecoder(bytes.NewReader(fc))
encoder = xml.NewEncoder(out)
t, err := decoder.Token()
if err == io.EOF {
return
}
tokens := setTokens(t)
tokens.toStr()
encoder.Encode(t)
}
An input xml like this:
<ParamSection SectVersion="1">
<Version>22</Version>
</ParamSection>
And an output like this:
<ParamSection SectVersion="1">
<Version>22</Version>
</ParamSection><StartElement><Name></Name><Attr><Name></Name><Value>1</Value></Attr></StartElement>
Which is more than nothing. There are two obvious problems:
istead of a \t (tabulator)
<StartElement><Name></Name><Attr><Name></Name><Value>1</Value></Attr></StartElement>
instead of nothing (Encoder seems to append the attribs of the first
field).
Any idea what is the problem?