Could not be unmarshalled

Hello,

I tried the jsonix PO example, it works fine with marshalling and unmarshalling.

When I try to implement it in my use case I am getting the following error
Error: Element [{http://www.w3.org/2001/XMLSchema}xsd:schema] could not be unmarshalled as is not known in this context and the property does not allow DOM content.

Steps:

1. created INVOICE.js in mappings folder using below command
   java -jar \lib\jsonix-schema-compiler-full-2.3.9.jar -d mappings -p INVOICE https://docs.oasis-open.org/ubl/os-UBL-2.1/xsd/maindoc/UBL-Invoice-2.1.xsd

2. stored the same xsd (https://docs.oasis-open.org/ubl/os-UBL-2.1/xsd/maindoc/UBL-Invoice-2.1.xsd) as an example in invoice.xml

const Jsonix = require('jsonix').Jsonix,
    INVOICE = require('../mappings/INVOICE'),
    context = new Jsonix.Context([INVOICE]),
    unmarshaller = context.createUnmarshaller();

unmarshaller.unmarshalFile('../mappings/invoice.xml',
    function (unmarshalled) {
        console.log(unmarshalled.value.cac:InvoicePeriod.cbc:StartDate);
    });

Any help will be highly appreciated. Thanks

PS: code jsonixInvoice for reference

まず mappings/INVOICE.js と mappings/invoice.xml から始め、context.createUnmarshaller() と unmarshalFile() を通じて失敗を再現します。このケースを、動作する JSONix PO の例および jsonixInvoice リファレンスリポジトリと比較します。提供された invoice.xml が unknown-element エラーなしでアンマーシャルされ、callback から請求書データにアクセスできれば完了です。