The billstclair/elm-xml-extra package is an extension of the billstclair/elm-xml-eeue56 package that simplifies creating Decoders for XML it parses.

Given these definitions:

import Json.Decoder as JD exposing ( Decoder )
import Xml.Extra exposing ( decodeXml )

type alias Person =
    { name : String
    , age : Int
    }

personDecoder : Decoder Person
personDecoder =
    JD.map2 Person
        (JD.field "name" JD.string)
        (JD.field "age" JD.int)

personTagSpecs : List TagSpec
personTagSpecs =
    [ ("name", Required)
    , ("age", Required)
    ]
   
xml =
    """
<?xml version="1.0" encoding="UTF-8"?>
<person>
  <name>noah</name>
  <age max="100">50</age>
</person>
    """

Here's the code to turn that XML string into a Person object:

decodeXml xml "person" personDecoder personTagSpecs

There's a more complicated example at the top of the documentation for the Xml.Extra module.

If your XML has more than one top-level tag, you can use the other exported functions, which the code for decodeXml should help you understand, to handle it.

There's an example in the example directory.

There are elm-test tests in the tests directory.