// works only if data is successfully parsed
// otherwise prints information about error with parsing
var error: NSError?
if let xmlDoc = AEXMLDocument(xmlData: data, error: &error) {
    
    // prints the same XML structure as original
    println(xmlDoc.xmlString)
    
    // prints cats, dogs
    for child in xmlDoc.root.children {
        println(child.name)
    }
    
    // prints Optional("Tinna") (first element)
    println(xmlDoc.root["cats"]["cat"].value)

    // prints Tinna (first element)
    println(xmlDoc.root["cats"]["cat"].stringValue)

    // prints Optional("Kika") (last element)
    println(xmlDoc.root["dogs"]["dog"].last?.value)

    // prints Betty (3rd element)
    println(xmlDoc.root["dogs"].children[2].stringValue)

    // prints Tinna, Rose, Caesar
    if let cats = xmlDoc.root["cats"]["cat"].all {
        for cat in cats {
            if let name = cat.value {
                println(name)
            }
        }
    }
    
    // prints Villy, Spot
    for dog in xmlDoc.root["dogs"]["dog"].all! {
        if let color = dog.attributes["color"] as? String {
            if color == "white" {
                println(dog.stringValue)
            }
        }
    }
    
    // prints Caesar
    if let cats = xmlDoc.root["cats"]["cat"].allWithAttributes(["breed" : "Domestic", "color" : "yellow"]) {
        for cat in cats {
            println(cat.stringValue)
        }
    }
    
    // prints 4
    println(xmlDoc.root["cats"]["cat"].count)
    
    // prints 2
    println(xmlDoc.root["dogs"]["dog"].countWithAttributes(["breed" : "Bull Terrier"]))
    
    // prints 1
    println(xmlDoc.root["cats"]["cat"].countWithAttributes(["breed" : "Domestic", "color" : "darkgray"]))
    
    // prints Siberian
    println(xmlDoc.root["cats"]["cat"].attributes["breed"]!)
    
    // prints <cat breed="Siberian" color="lightgray">Tinna</cat>
    println(xmlDoc.root["cats"]["cat"].xmlStringCompact)
    
    // prints element <badexample> not found
    println(xmlDoc["badexample"]["notexisting"].stringValue)
    
} else {
    println("description: \(error?.localizedDescription)\ninfo: \(error?.userInfo)")
}

// prints the same XML structure as original
let soapRequest = AEXMLDocument()
let attributes = ["xmlns:xsi" : "http://www.w3.org/2001/XMLSchema-instance", "xmlns:xsd" : "http://www.w3.org/2001/XMLSchema"]
let envelope = soapRequest.addChild(name: "soap:Envelope", attributes: attributes)
let header = envelope.addChild(name: "soap:Header")
let body = envelope.addChild(name: "soap:Body")
header.addChild(name: "m:Trans", value: "234", attributes: ["xmlns:m" : "http://www.w3schools.com/transaction/", "soap:mustUnderstand" : "1"])
let getStockPrice = body.addChild(name: "m:GetStockPrice")
getStockPrice.addChild(name: "m:StockName", value: "AAPL")
println(soapRequest.xmlString)