(Swift) Create SOAP with multiple VeriFactu Digitally Signed Registration Records

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func chilkatTest() {
    var success: Bool = false

    success = true

    // Begin with the following SOAP XML:

    // <?xml version="1.0" encoding="utf-8"?>
    // <soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:sum="https://www2.agenciatributaria.gob.es/static_files/common/internet/dep/aplicaciones/es/aeat/tike/cont/ws/SuministroLR.xsd" xmlns:sum1="https://www2.agenciatributaria.gob.es/static_files/common/internet/dep/aplicaciones/es/aeat/tike/cont/ws/SuministroInformacion.xsd" xmlns:xd="http://www.w3.org/2000/09/xmldsig#">
    //     <soapenv:Header/>
    //     <soapenv:Body>
    //         <sum:RegFactuSistemaFacturacion>
    //             <sum:Cabecera>
    //                 <sum1:ObligadoEmision>
    //                     <sum1:NombreRazon>XYZ STORE SL</sum1:NombreRazon>
    //                     <sum1:NIF>B99999999</sum1:NIF>
    //                 </sum1:ObligadoEmision>
    //                 <sum1:RemisionRequerimiento>
    //                     <sum1:RefRequerimiento>3333333333</sum1:RefRequerimiento>
    //                     <sum1:FinRequerimiento>S</sum1:FinRequerimiento>
    //                 </sum1:RemisionRequerimiento>
    //             </sum:Cabecera>
    // 
    //         </sum:RegFactuSistemaFacturacion>
    //     </soapenv:Body>
    // </soapenv:Envelope>

    let xml = CkoXml()!
    xml.tag = "soapenv:Envelope"
    xml.addAttribute("xmlns:soapenv", value: "http://schemas.xmlsoap.org/soap/envelope/")
    xml.addAttribute("xmlns:sum", value: "https://www2.agenciatributaria.gob.es/static_files/common/internet/dep/aplicaciones/es/aeat/tike/cont/ws/SuministroLR.xsd")
    xml.addAttribute("xmlns:sum1", value: "https://www2.agenciatributaria.gob.es/static_files/common/internet/dep/aplicaciones/es/aeat/tike/cont/ws/SuministroInformacion.xsd")
    xml.addAttribute("xmlns:xd", value: "http://www.w3.org/2000/09/xmldsig#")
    xml.updateChildContent("soapenv:Header", value: "")
    xml.updateChildContent("soapenv:Body|sum:RegFactuSistemaFacturacion|sum:Cabecera|sum1:ObligadoEmision|sum1:NombreRazon", value: "XYZ STORE SL")
    xml.updateChildContent("soapenv:Body|sum:RegFactuSistemaFacturacion|sum:Cabecera|sum1:ObligadoEmision|sum1:NIF", value: "B99999999")
    xml.updateChildContent("soapenv:Body|sum:RegFactuSistemaFacturacion|sum:Cabecera|sum1:RemisionRequerimiento|sum1:RefRequerimiento", value: "3333333333")
    xml.updateChildContent("soapenv:Body|sum:RegFactuSistemaFacturacion|sum:Cabecera|sum1:RemisionRequerimiento|sum1:FinRequerimiento", value: "S")

    // Prior to this code, we created N signed SOAP messages, each containing a single signed record.
    // Load each of these signed SOAP messages into a StringBuilder and insert after the "</sum:Cabecera>"
    // Note: We must NOT use Chilkat.Xml for this.  We must do string operations using Chilkat StringBuilder to prevent whitespace or formatting modifications which would break the signatures.

    let sbXml = CkoStringBuilder()!
    xml.getSb(sbXml)

    // ---------------------------------------------------------------------------------------------
    // Load the previously signed XML containing just one signed record.
    let sbSignedSoap = CkoStringBuilder()!
    success = sbSignedSoap.loadFile("c:/temp/qa_output/signedSoapXml1.xml", charset: "utf-8")
    if success == false {
        print("\(sbSignedSoap.lastErrorText!)")
        return
    }

    // Remove everything before "</sum:Cabecera>", including the "</sum:Cabecera>"
    sbSignedSoap.remove(before: "</sum:Cabecera>")

    // Remove everything after the "</sum:RegFactuSistemaFacturacion>", including the "</sum:RegFactuSistemaFacturacion>"
    sbSignedSoap.removeAfterFinal("</sum:RegFactuSistemaFacturacion>")

    // We now have the portion of the signed SOAP xml from <sum:RegistroFactura> to </sum:RegistroFactura>
    // Insert it after the </sum:Cabecera>
    sbSignedSoap.prepend("</sum:Cabecera>")
    sbXml.replaceFirst("</sum:Cabecera>", replacement: sbSignedSoap.getAsString())

    // ---------------------------------------------------------------------------------------------
    // Add the next signed SOAP containing a single signed record.
    success = sbSignedSoap.loadFile("c:/temp/qa_output/signedSoapXml2.xml", charset: "utf-8")
    if success == false {
        print("\(sbSignedSoap.lastErrorText!)")
        return
    }

    // Remove everything before "</sum:Cabecera>", including the "</sum:Cabecera>"
    sbSignedSoap.remove(before: "</sum:Cabecera>")

    // Remove everything after the "</sum:RegFactuSistemaFacturacion>", including the "</sum:RegFactuSistemaFacturacion>"
    sbSignedSoap.removeAfterFinal("</sum:RegFactuSistemaFacturacion>")

    // We now have the portion of the signed SOAP xml from <sum:RegistroFactura> to </sum:RegistroFactura>
    // Insert it after the </sum:Cabecera>
    sbSignedSoap.prepend("</sum:Cabecera>")
    sbXml.replaceFirst("</sum:Cabecera>", replacement: sbSignedSoap.getAsString())

    // ---------------------------------------------------------------------------------------------
    // Continue adding more signed records if needed.

    // Save the SOAP containing multiple signed records..
    sbXml.writeFile("c:/temp/qa_output/soap_combined.xml", charset: "utf-8", emitBom: false)

}