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I am parsing data and instansiating struct each Time root element (objstation) is parsed and encoding to DATA to write to plist

XML Structure

<objStation>
 <StationDesc>Killester</StationDesc>
 <StationAlias/>
 <StationLatitude>53.373</StationLatitude>
 <StationLongitude>-6.20442</StationLongitude>
 <StationCode>KLSTR</StationCode>
 <StationId>101</StationId>
 </objStation>
 <objStation>
 <StationDesc>Clontarf Road</StationDesc>
 <StationAlias/>
 <StationLatitude>53.3629</StationLatitude>
 <StationLongitude>-6.22753</StationLongitude>
 <StationCode>CTARF</StationCode>
 <StationId>109</StationId>
 </objStation>

I am using the following method in my struct to encode and write to plist, however only the current instance of the struct is saved to the plist, I am wondering how to append to the plist, so all root elements are saved to the plist, I have played around with various swift native functions around the DATA type but have had no joy.
Maybe I should be using an array of dictionaries rather than a struct for this?

 //mark properties, update as necssary, based on xml strucutre
struct StationsEncoder: Codable 

 var station: String
 var latitude: String
 var longitude: String
 var code: String
 var id: String

 //MARK: Initialization

 init(station: String, latitude: String, longitude: String, code: String, id: String ) 
 self.station = station
 self.latitude = latitude
 self.longitude = longitude
 self.code = code
 self.id = id
 

 //mark initializers
 // lets try encode our data
 func encoder()
 let stationStruct = StationsEncoder(station: station, latitude: latitude, longitude: longitude, code: code, id: id)
 let encoder = PropertyListEncoder()
 encoder.outputFormat = .xml
 do 
 let data = try encoder.encode(stationStruct)
 try data.write(to: CreatePlist.shared.plistURL)

 catch 
 // Handle error
 print(error)
 print( CreatePlist.shared.plistURL)
 
 

I accomplished this with a tiny bit of code using PropertyListSerialization method (thanks again to Maddy who saved time pointing out that you cannot append to a plist). The best option I found was to append to a dictionary first, then write out entire dictionary to plist:

do 
 let writeData = try PropertyListSerialization.data(fromPropertyList: [parsedDictionary], format: .xml, options:0)
 //note CreatePlist.shared.plistURL is my URL, just replace with yours, I am accessing a singleton class that has the URL here for convenience: 
 try writeData.write(to: CreatePlist.shared.plistURL)
 catch 
 print(error)