its.xsd

<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" elementFormDefault="qualified" targetNamespace="http://www.w3.org/2005/11/its" xmlns:its="http://www.w3.org/2005/11/its">
  <xs:import schemaLocation="SMIL.xsd"/>
  <xs:import namespace="http://www.w3.org/XML/1998/namespace" schemaLocation="xml.xsd"/>
  <xs:attribute name="translate">
    <xs:simpleType>
      <xs:restriction base="xs:token">
        <xs:enumeration value="yes"/>
        <xs:enumeration value="no"/>
      </xs:restriction>
    </xs:simpleType>
  </xs:attribute>
  <xs:attribute name="locNote"/>
  <xs:attribute name="locNoteType">
    <xs:simpleType>
      <xs:restriction base="xs:token">
        <xs:enumeration value="alert"/>
        <xs:enumeration value="description"/>
      </xs:restriction>
    </xs:simpleType>
  </xs:attribute>
  <xs:attribute name="locNoteRef"/>
  <xs:attribute name="termInfoRef"/>
  <xs:attribute name="term">
    <xs:simpleType>
      <xs:restriction base="xs:token">
        <xs:enumeration value="yes"/>
        <xs:enumeration value="no"/>
      </xs:restriction>
    </xs:simpleType>
  </xs:attribute>
  <xs:attribute name="dir">
    <xs:simpleType>
      <xs:restriction base="xs:token">
        <xs:enumeration value="ltr"/>
        <xs:enumeration value="rtl"/>
        <xs:enumeration value="lro"/>
        <xs:enumeration value="rlo"/>
      </xs:restriction>
    </xs:simpleType>
  </xs:attribute>
</xs:schema>