unmarshaling XML type with a choice element

[DrGo]

Hello,

Any suggestions of an easy way to use Go's builtin encoding/xml to unmarshall an XML type that has a choice element (http://www.w3schools.com/schema/el_choice.asp)

Essentially I have the following struct

type Field struct {

XMLName xml.Name `xml:"field"`

Id      string   `xml:"id,attr"`

Label   string   `xml:"label,attr"`

        ChoiceField  ??????

}

ChoiceField  can be one (and only one) of three possible elements:

1) Value with 2 attributes (including an ID) and 3 children string elements

2) Simple value: with 2 attributes (including an ID)

3) Reference value with 7 attributes (including an ID)

It is not obvious to me how to unmarshall this data. Add an innerxml and then "hand" parse it? Other ideas?

Thanks,

[Giulio Iotti]

On Thursday, October 29, 2015 at 11:08:34 PM UTC+1, DrGo wrote:

ChoiceField  can be one (and only one) of three possible elements:

1) Value with 2 attributes (including an ID) and 3 children string elements

2) Simple value: with 2 attributes (including an ID)

3) Reference value with 7 attributes (including an ID)

Make a struct with all three things in it (a slice of values with two attrs, a simple value with one attr...). The unmarshaller will use them properly.

Can you make a play example with the XML to parse? It's much easier to play with. Thank you :)

-- 

Giulio Iotti 

[DrGo]

Thanks Giulio,

I kind ended up doing what you said (I think). Here is what I have so far http://play.golang.org/p/A1uTpFq6Fr

I had a problem with the Value type. 

when I refer to the type in my Field type I can read the attributes but not the contents.

when I "unpack" its fields into the Field type I can read the contents but not attributes.

Not sure what I am doing wrong,

Best

[Matt Harden]

http://play.golang.org/p/TrxIsfBxw8

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[DrGo]

Thanks Matt,

Have a nice weekend,