XSD - Validator problem

Hi,

I have a problem and hope someone might help me. In my work with Extensible Textual Format I wanted to use an schema file that I found within an IBM project. I used "XML-Spy" to validate the schema and everytime it throws an error in the first line of code. I really don't see any error there. Maybe somone of you knows it. Therefore I posted the first lines of code above. Is there maybe a difference in the specification of schema that different validators use? 


Thanks for help,  Sebastian

<?xml version="1.0" encoding="UTF-8"?>
<schema xmlns="http://www.w3.org/2001/XMLSchema"
        xmlns:xmta="urn:mpeg:mpeg4:xmta:schema:2002"
        targetNamespace="urn:mpeg:mpeg4:xmta:schema:2002"     elementFormDefault="qualified">
<annotation>
 <documentation> eXtensible MPEG Textual (XMT-A) format Schema          </documentation>
</annotation>
<annotation>
  <documentation> Field types </documentation>
</annotation>
   <simpleType name="SFBool">
      <restriction base="boolean"/>

...



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