<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" elementFormDefault="qualified" targetNamespace="http://www.w3.org/XML/1998/namespace">
  <xs:import schemaLocation="pretext.xsd"/>
  <xs:attribute name="lang"/>
  <xs:attribute name="base"/>
  <xs:attribute name="id"/>
</xs:schema>