转到节点N的XML解组属性X

Question

I would like to unmarshall the value of an attribute X of specific node N to a struct field. Something like this:

var data = `<A id="A_ID">
<B id="B_ID">Something</B>
</A>
`

type A struct {
    Id   string `xml:"id,attr"` // A_ID
    Name string `xml:"B.id,attr"` // B_ID
}

http://play.golang.org/p/U6daYJWVUX

As far as I was able to check this is not supported by Go. Am I correct, or am I missing something here?

Answer 1

In your question you are not mentioning B. I'm guessing that you need to unmarshal its attr into A.Name? If so - you could change your A struct to something like this:

type A struct {
    Id string `xml:"id,attr"` // A_ID
    Name  struct {
        Id string `xml:"id,attr"` // B_ID
    } `xml:"B"`
}

Or maybe even better - define separate B struct:

type A struct {
    Id string `xml:"id,attr"` // A_ID
    Name  B `xml:"B"`
}

type B struct {
    Id string `xml:"id,attr"` // B_ID
}