(Swift 3,4,5...) Find XML Element where Attribute = Value

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Finds an XML element at a particular location where an attribute has a specified value.

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func chilkatTest() {
    // We have the following XML and wish to find the value of the time attribute where msg = "alert-from".

    // <cdr id="4e5d3e7f41bf6201ad81000c29703270" e164="6207">
    //     <user>
    //         <grp name="wfln" mode="active"/>
    //     </user>
    //     <event msg="setup-to" time="287069" e164="5034"/>
    //     <event msg="alert-from" time="287069" e164="5034"/>
    //     <event msg="rel-to" time="287079" e164="5034"/>
    // </cdr>

    var success: Bool

    // First, build the above XML:

    let xml = CkoXml()!
    xml.tag = "cdr"
    xml.addAttribute("id", value: "4e5d3e7f41bf6201ad81000c29703270")
    xml.addAttribute("e164", value: "6207")
    xml.updateAttr(at: "user|grp", autoCreate: true, attrName: "name", attrValue: "wfln")
    xml.updateAttr(at: "user|grp", autoCreate: true, attrName: "mode", attrValue: "active")
    xml.updateAttr(at: "event", autoCreate: true, attrName: "msg", attrValue: "setup-to")
    xml.updateAttr(at: "event", autoCreate: true, attrName: "time", attrValue: "287069")
    xml.updateAttr(at: "event", autoCreate: true, attrName: "e164", attrValue: "5034")
    xml.updateAttr(at: "event[1]", autoCreate: true, attrName: "msg", attrValue: "alert-from")
    xml.updateAttr(at: "event[1]", autoCreate: true, attrName: "time", attrValue: "287069")
    xml.updateAttr(at: "event[1]", autoCreate: true, attrName: "e164", attrValue: "5034")
    xml.updateAttr(at: "event[2]", autoCreate: true, attrName: "msg", attrValue: "rel-to")
    xml.updateAttr(at: "event[2]", autoCreate: true, attrName: "time", attrValue: "287079")
    xml.updateAttr(at: "event[2]", autoCreate: true, attrName: "e164", attrValue: "5034")

    // Show that we have the above XML
    print("\(xml.getXml()!)")

    // Find the element where msg = "alert-from"
    // This updates the xml object's reference to the found element (if successful).
    var notUsed: String? = xml.chilkatPath("/A/event,msg,alert-from|$")
    if xml.lastMethodSuccess == false {
        print("Not found.")
        return
    }

    // Get the value of the "time" attribute.
    print("time = \(xml.getAttrValue("time")!)")

    // Restore the xml object's internal reference to the root of the XML document
    xml.getRoot2()

}