(Swift 3,4,5...) GetChild* methods

Demonstrates several of the GetChild* methods.

The input XML, available at http://www.chilkatsoft.com/data/get_child.xml, is this:

<root>
    <fruit color="red">apple</fruit>
    <fruit color="green">pear</fruit>
    <veg color="orange">carrot</veg>
    <meat animal="cow">beef</meat>
    <xyz>
        <fruit color="blue">blueberry</fruit>
        <veg color="green">broccoli</veg>
    </xyz>
    <fruit color="purple">grape</fruit>
    <cheese color="yellow">cheddar</cheese>
</root>

The output XML is this:

<abc b="pear" c="orange" a="130">Test</abc>

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func chilkatTest() {
    let xml = CkoXml()!
    var child: CkoXml?

    var success: Bool
    // The sample input XML is available at http://www.chilkatsoft.com/data/get_child.xml
    success = xml.loadFile("get_child.xml")
    if success != true {
        print("\(xml.lastErrorText!)")
        return
    }

    // The NumChildren property contains the number of direct
    // child nodes.  Note: The child nodes under "xyz" are NOT
    // direct children of "root".  Therefore, the "root" node has
    // 7 direct children
    print("NumChildren = \(xml.numChildren.intValue)")

    // Iterate over the direct children by index. The first child
    // is at index 0.
    var i: Int
    for i = 0; i <= xml.numChildren.intValue - 1; i++ {
        //  access the tag and content directly by index:
        print("\(i): \(xml.getChildTag(byIndex: i)!) : \(xml.getChildContent(byIndex: i)!)")

    }

    print("-----")

    // Do the same as the above loop, but get the child node
    // and access the Tag and Content properties:
    for i = 0; i <= xml.numChildren.intValue - 1; i++ {
        child = xml.getChild(i)
        print("\(i): \(child!.tag!) : \(child!.content!)")
        child = nil
    }

    print("-----")

    // Do the same as the above loop, but instead of creating
    // a new object instance for each child, call GetChild2 to
    // update the object's reference instead.
    for i = 0; i <= xml.numChildren.intValue - 1; i++ {
        // Navigate to the Nth child.  
        success = xml.getChild2(i)
        print("\(i): \(xml.tag!) : \(xml.content!)")
        // Navigate back up to the parent:
        success = xml.getParent2()
    }

    print("-----")

    // Examine the result:
    print("\(xml.getXml()!)")

}