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What is the difference between IDREF and IDREFS in XSD?

What is the difference between IDREF and IDREFS in XSD?
I know that both of them refer to the ID attribute, but what is the difference? When is each of them used?

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An IDREF type attribute is a reference to some other element with a type identifier attribute.

An attribute of type IDREFS is a list of links to elements with identifier attributes, separated by spaces.

Example:

You create a family tree. Each person has 2 parents, a mother and a father. This is indicated by IDREFS as follows:

<person person_id="e10001" parent_id="e10002 e10003">

from

  <!ATTLIST person person_id ID #REQUIRED parent_id IDREFS #IMPLIED>
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Source: https://habr.com/ru/post/920396/

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