How to Handle Unknown XML Attributes During Unmarshalling in Go?

Unmarshalling XML Attributes with Unknown Quantities Using Golang

In Golang, unmarshalling XML involves parsing XML data into a struct, allowing for convenient data manipulation and retrieval. However, certain scenarios require the handling of unexpected XML attributes, where the attribute names and values may vary across instances.

The encoding/xml package provides support for unmarshalling XML elements with dynamic attributes through the xml:",any,attr" annotation. This feature enables the collection of all attributes into a slice of xml.Attr within the struct.

To illustrate this capability, consider the following code:

package main

import (
    "encoding/xml"
    "fmt"
)

func main() {
    var v struct {
        Attributes []xml.Attr `xml:",any,attr"`
    }

    data := `<tag attr1="VALUE1" attr2="VALUE2"></tag>`

    err := xml.Unmarshal([]byte(data), &v)
    if err != nil {
        panic(err)
    }
    fmt.Println(v.Attributes)
}

When executed, this code will output the following:

[{ATTR1 VALUE1} {ATTR2 VALUE2}]

Each entry in the Attributes slice represents an attribute, consisting of its name (e.g., "ATTR1") and value (e.g., "VALUE1").

This enhancement empowers developers to work with XML documents containing unknown or dynamic attributes, making Go an even more versatile tool for XML processing.

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