how to parse xml files from a downloaded url file in swift

Question

[delcophantom8491]

I am attempting to parse an XML file from the NCBI website using swift. When the file is in my Xcode project I have the code to parse that. I also have the code to download the file into swift. I am having trouble that once it is downloaded how to do I call the file and parse it from there. Below is my code for parsing the file that is in my Xcode project.

import UIKit
import XMLCoder

struct GBSet: Decodable{
    let GBSeq: GBSeq

}

struct GBSeq: Decodable{
    let GBSeq_locus: String
    let GBSeq_length: String
    let GBSeq_strandedness: String
    let GBSeq_moltype: String
    let GBSeq_definition: String
    let GBSeq_topology: String
    let GBSeq_keywords: String
    let GBSeq_source: String
    let GBSeq_organism: String
    let GBSeq_taxonomy: String
    let GBSeq_sequence: String
}
class ViewController: UIViewController, XMLParserDelegate {

    override func viewDidLoad() {
        super.viewDidLoad()
 let filePath = Bundle.main.path(forResource: "sequence", ofType: "xml")
       let data = try! Data(contentsOf: URL(fileURLWithPath: filePath!))

       let gbSet = try! XMLDecoder().decode(GBSet.self, from: data)
        print(gbSet)
}
}

Below is my code for downloading the xml file via url.

class ViewController: UIViewController, XMLParserDelegate {

    override func viewDidLoad() {
        super.viewDidLoad()
let seqId = "AB003468"
                let urlString = "https://www.ncbi.nlm.nih.gov/sviewer/viewer.cgi?tool=portal&save=file&log$=seqview&db=nuccore&report=gbc_xml&id=\(seqId)&conwithfeat=on&withparts=on&hide-cdd=on"
                let url = URL(string: urlString)!

                URLSession.shared.dataTask(with: url) { (data, response, error) in
                    if let error = error {
                        print(error.localizedDescription)
                        return
                    }

                    guard let data = data else {
                        print("invalid data!")
                        return
                    }

                    print(String(data: data, encoding: .utf8)!)
                }
                .resume()

How can I connect the two and download the file and then parse the file?