XML not showing an error with XML schema 1.1

I have set XML schema version to 1.1 in Idea's settings, but this XML:

<?xml version="1.0" encoding="UTF-8"?>
<data min="14" max="10" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="assert.xsd" />

does not show an error for min being greater than max with this XSD:

<xs:schema attributeFormDefault="unqualified" elementFormDefault="qualified" xmlns:xs="http://www.w3.org/2001/XMLSchema">
    <xs:element name="data">
       <xs:complexType>
          <xs:attribute name="min" type="xs:int"/>
          <xs:attribute name="max" type="xs:int"/>
          <xs:assert test="@min le @max"/>
       </xs:complexType>
    </xs:element>
</xs:schema>

Is there a problem with IDEA, or does the value in settings only affect the validation of the XSD and not the XML?