(Swift 3,4,5...) Remove an XML Subtree

Demonstrates how to remove an XML subtree from an XML document.

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func chilkatTest() {
    let xml = CkoXml()!

    var success: Bool = xml.loadFile("qa_data/xml/osszes.xml")

    // The XML file we're loading contains this:

    // <?xml version="1.0" encoding="iso-8859-2" ?>
    // <EXAMPLE>
    //     <OSSZES>
    //         <ROW TYPE="INS">477953
    //             <NUMBER>05107003972</NUMBER>
    //         </ROW>
    //         <ROW TYPE="INS">477954
    //             <NUMBER>05107001342</NUMBER>
    //         </ROW>
    //         <ROW TYPE="INS">477955
    //             <NUMBER>05107001342</NUMBER>
    //         </ROW>
    //         <ROW TYPE="INS">477956
    //             <NUMBER>05107000017</NUMBER>
    //         </ROW>**
    //         <ROW TYPE="INS">477957
    //             <NUMBER>05107002182</NUMBER>
    //         </ROW>
    //     </OSSZES>
    // </EXAMPLE>
    // 

    // We wish to remove this subtree:

    // <ROW TYPE="INS">477956
    //     <NUMBER>05107000017</NUMBER>
    // </ROW>

    // Get another reference to the XML document.
    var xml2: CkoXml? = xml.getSelf()

    // Navigate to the node that is the root of the subtree to be deleted.
    // In this case, we wish to find the node having tag "ROW" with content "477956"
    var notUsed: String? = xml2!.chilkatPath("OSSZES|/C/ROW,*477956*|$")

    // Examine the xml2, it should be just the subtree.
    print("\(xml2!.getXml()!)")

    // Now detach xml2 from the it's XML document.
    // xml2 will now be it's own XML document.
    xml2!.removeFromTree()

    // Examine our original XML document.  The subtree is removed:
    print("\(xml.getXml()!)")

    xml2 = nil

}