(Swift 3,4,5...) Insert XML into existing XML by calling InsertChildTreeAfter

Demonstrates how to insert an XML tree or subtree into another XML document using the InsertChildTreeAfter method.

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func chilkatTest() {
    // Build the 1st XML document:
    // <x1>
    //     <a1>1</a1>
    //     <a2>2</a2>
    //     <a3>3</a3>
    // </x1>

    let xml = CkoXml()!
    xml.tag = "x1"
    xml.updateChildContent("a1", value: "1")
    xml.updateChildContent("a2", value: "2")
    xml.updateChildContent("a3", value: "3")

    // Build a 2nd XML document:

    // <x2>
    //   <b1>11</b1>
    //   <b2>22</b2>
    //   <b3>33</b3>
    // </x2>

    let xml2 = CkoXml()!
    xml2.tag = "x2"
    xml2.updateChildContent("b1", value: "11")
    xml2.updateChildContent("b2", value: "22")
    xml2.updateChildContent("b3", value: "33")

    // We want to insert xml2 into xml to get this:

    // <x1>
    //     <a1>1</a1>
    //     <x2>
    //         <b1>11</b1>
    //         <b2>22</b2>
    //         <b3>33</b3>
    //     </x2>
    //     <a2>2</a2>
    //     <a3>3</a3>
    // </x1>

    // Insert xml2 after "a1"

    var index: Int = xml.tagIndex("a1").intValue
    if index < 0 {
        print("a1 not found.")
        return
    }

    xml.insertChildTree(after: index, tree: xml2)

    print("\(xml.getXml()!)")

    // The result is:

    // <x1>
    //     <a1>1</a1>
    //     <x2>
    //         <b1>11</b1>
    //         <b2>22</b2>
    //         <b3>33</b3>
    //     </x2>
    //     <a2>2</a2>
    //     <a3>3</a3>
    // </x1>

    // Note: xml2 now points to the subtree within xml.
    // For example, update "b3" and then see how it's updated within the merged document:
    xml2.updateChildContent("b3", value: "33333333")

    print("\(xml.getXml()!)")

    // The result:

    // <x1>
    //     <a1>1</a1>
    //     <x2>
    //         <b1>11</b1>
    //         <b2>22</b2>
    //         <b3>33333333</b3>
    //     </x2>
    //     <a2>2</a2>
    //     <a3>3</a3>
    // </x1>

}