(Swift 3,4,5...) Demonstrate the XML FindNextRecord Method

Imagine we have an XML file as follows:

<CompleteMultipartUpload>
  <Part>
    <PartNumber>1</PartNumber>
    <ETag>abc</ETag>
  </Part>
  <Part>
    <PartNumber>2</PartNumber>
    <ETag>def</ETag>
  </Part>
  <Part>
    <PartNumber>3</PartNumber>
    <ETag>ghi</ETag>
  </Part>
</CompleteMultipartUpload>

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

    xml.loadFile("qa_data/xml/multipartUpload.xml")

    // Position ourselves at the 1st record.
    xml.getChild2(0)

    var foundRec: CkoXml? = xml.findNextRecord("PartNumber", contentPattern: "2")
    if xml.lastMethodSuccess == true {
        print("Found the record where PartNumber = 2.")
        print("\(foundRec!.getXml()!)")

        // Let's examine the ETag for this record...
        print("ETag for PartNumber 2 = \(foundRec!.getChildContent("ETag")!)")
        foundRec = nil
    }
    else {
        print("No record exists where PartNumber = 2.")
    }

    // What if we want to find the record where ETag = "abc"?
    foundRec = xml.findNextRecord("ETag", contentPattern: "abc")
    if xml.lastMethodSuccess == true {
        print("Found the record where ETag = abc")
        print("\(foundRec!.getXml()!)")

        // Let's examine the PartNumber for this record...
        print("Part number for Etag(abc) = \(foundRec!.getChildContent("PartNumber")!)")
        foundRec = nil
    }
    else {
        print("No record exists where ETag = abc.")
    }

    // Go back to the XML root..
    xml.getRoot2()

}