How to indicate the mandatory nature of a separate element in an XSD schema?

Question

XSD

I broke my brain...
Given: xml documents.
Task: write XSD schemas for them.

<?xml version="1.0" encoding="UTF-8" ?>
  <form>
    <id>обязателен</id>
    <deliveryMethod>обязателен</deliveryMethod>
    <date></date>
    <sum></sum>
  </form>

It is possible to set it as mandatory through the use attribute and property:
<xs:attribute name="r" use="required" />
But then this attribute will appear in the resulting XML, which is not allowed:
<id use="required">обязателен</id>
No information was found on this feature. It turns out that these schemes are useless if the most important thing cannot be indicated in them.
How to be?

Answer 1

The answer to the question is found here .
The problem is solved through the ass: you need to set the optional NOT mandatory :) elements by setting the parameters minOccurs=0 and maxOccurs=1.
The rest of the elements are considered required by default.