<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE schema PUBLIC "-//W3C//DTD XMLSCHEMA 200102//EN" "http://www.w3.org/2001/XMLSchema.dtd">
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
  <xs:element name="extension">
    <xs:complexType>
      <xs:attribute name="point" type="xs:string" use="required"/>
    </xs:complexType>
  </xs:element>
</xs:schema>
