how do i create a soap/xml envelope

how can i create a soap envelope of the following form, to send to an external api?

<?xml version="1.0" encoding="utf-8"?>
<soap:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
  <soap:Body>
    <CreateNewProduct xmlns="http://example.com/">
      <Login>string</Login>
      <Password>string</Password>
      <SKU>string</SKU>
      <ProductDescription>string</ProductDescription>
      <UPCCode>string</UPCCode>
      <ProductRequiresLotNumbers>string</ProductRequiresLotNumbers>
      <ServiceUnit>string</ServiceUnit>
      <ServiceUnitQuantity>string</ServiceUnitQuantity>
      <Weight>string</Weight>
      <DefaultUnitPrice>string</DefaultUnitPrice>
      <CountryOfOrigin>string</CountryOfOrigin>
      <HarmonizedCode>string</HarmonizedCode>
    </CreateNewProduct>
  </soap:Body>
</soap:Envelope>