How to create correct yml file structure?

Question

1C-Bitrix

I unload yml from the test site using standard tools. I check with the help of the validator https://webmaster.yandex.ru/tools/xml-validator/. I check in all available ways (inserting the contents of the file, directly downloading the file and a link), and with each method of checking, the validator gives different errors. The file has not been customized. I understand that Bitrix puts spokes in the wheel from the very beginning and creates a crooked structure for yml? Or what could be wrong? Link to the file
ch55017-bitrix.tw1.ru/bitrix/catalog_export/yandex.php

Answer 1

I choose the "Market" validation scheme, enter the address of your xml file.
Result: XML matches XSD schema
What's wrong?

Answer 2

What does TP say?
Yandex accepts a typical file for us.