how to ensure the value of attribute in the set of values of another attribute?

This is a parameters configure.

<params>
  <param name="use-schema" />
  <param name="schema-domain" relyon="use-schema" />
  <param name="schema-file" relyon="use-schema" />
</params>

And this is part of XSD content.

<xs:element name="param">
    <xs:complexType>
        <xs:attribute name="name" type="xs:string" use="required"/>
        <xs:attribute name="relyon" type="xs:string" />
    </xs:complexType>
</xs:element>

I wrote some basic xsd, but there's no restriction for relyon, how to write an XSD to ensure the value of attribute relyon is announced in params/param/@name?