Edit C:\Windows\System\Speech\speech-synthesis.xsd

<?xml version="1.0" encoding="UTF-8"?>
<!-- 
    This file is based on or incorporates material from the projects listed below
      (collectively, "Third Party Code"). Microsoft is not the original author of the
      Third Party Code. The original copyright notice and the license, under which Microsoft
      received such Third Party Code, are set forth below. Such licenses and notices are
      provided for informational purposes only. Microsoft, not the third party, licenses
      the Third Party Code to you under the terms set forth in the EULA for the Microsoft Product.
      Microsoft reserves all other rights not expressly granted under this agreement, whether by implication,
      estoppel or otherwise.

Provided for Informational Purposes Only

Copyright 1998-2004 W3C (MIT, ERCIM, Keio),
      All Rights Reserved. Permission to use, copy, modify and
      distribute the SSML core schema and its accompanying documentation
      for any purpose and without fee is hereby granted in
      perpetuity, provided that the above copyright notice and this
      paragraph appear in all copies.  The copyright holders make no
      representation about the suitability of the schema for any purpose.
      It is provided "as is" without expressed or implied warranty.  
  -->
<xsd:schema targetNamespace="http://www.w3.org/2001/10/synthesis" 
xmlns:xsd="http://www.w3.org/2001/XMLSchema" 
xmlns="http://www.w3.org/2001/10/synthesis" elementFormDefault="qualified">
  <xsd:annotation>
  <xsd:documentation>SSML 1.0 Schema (20040615)</xsd:documentation>
  </xsd:annotation>
  <xsd:annotation>
  <xsd:documentation>
    Copyright 1998-2004 W3C (MIT, ERCIM, Keio),
    All Rights Reserved. Permission to use, copy, modify and
    distribute the SSML schema and its accompanying documentation
    for any purpose and without fee is hereby granted in
    perpetuity, provided that the above copyright notice and this
    paragraph appear in all copies.  The copyright holders make no
    representation about the suitability of the schema for any purpose.
    It is provided "as is" without expressed or implied warranty.
  </xsd:documentation>
  </xsd:annotation>

<xsd:import namespace="http://www.w3.org/XML/1998/namespace" 
              schemaLocation="xml.xsd"/>
   <xsd:redefine schemaLocation="synthesis-core.xsd">

<xsd:annotation>
        <xsd:documentation>restriction: version and attributes on speak mandatory</xsd:documentation>
    </xsd:annotation>
        <xsd:complexType name="speak" mixed="true">
            <xsd:complexContent>
                <xsd:restriction base="speak">
    <xsd:group ref="speak.class"/>
    <xsd:attribute name="version" type="version.datatype"  use="required"/>
    <xsd:attribute ref="xml:lang" use="required"/>
    </xsd:restriction>
            </xsd:complexContent>
        </xsd:complexType>

<xsd:annotation>
        <xsd:documentation>restriction: src attribute on audio is mandatory</xsd:documentation>
    </xsd:annotation>
        <xsd:complexType name="audio" mixed="true">
            <xsd:complexContent>
                <xsd:restriction base="audio">
    <xsd:group ref="descAndSentenceAndStructure.class"/>
    <xsd:attribute name="src" type="xsd:anyURI" use="required"/>
    </xsd:restriction>
            </xsd:complexContent>
        </xsd:complexType>

<xsd:annotation>
        <xsd:documentation>restriction: name attribute on mark is mandatory</xsd:documentation>
    </xsd:annotation>
        <xsd:complexType name="mark">
            <xsd:complexContent>
                <xsd:restriction base="mark">
    <xsd:attribute name="name" type="xsd:token" use="required"/>
    </xsd:restriction>
            </xsd:complexContent>
  </xsd:complexType>

</xsd:redefine>

</xsd:schema>

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