complexType mixed="true" - stupid question?

hi all

i am not sure if i got the complexType wrong or if my parser has a problem 
with this. all i want to do is to define a type that allows this kind of 
element:
<td class="text" align="left">here goes the content</td>

the schema part is like this:

<xs:element name="td">
 <xs:complexType mixed="true">
  <xs:attribute name="align" type="typeColumnAlign" use="optional"/>
  <xs:attribute name="valign" type="typeColumnAlign" use="optional"/>
  <xs:attribute name="nowrap" type="xs:string" use="optional"/>
  <xs:attribute name="class" type="xs:string" use="optional"/>
  <xs:attribute name="colspan" type="xs:integer" use="optional"/>
  <xs:attribute name="rowspan" type="xs:integer" use="optional"/>
 </xs:complexType>
</xs:element>


the parser says, the schema is not valid.

org.xml.sax.SAXParseException: Schema error: Anonymous complexType: Type 
'#21': The content of a mixed complexType must not be empty.
....

has anybody made the same experience or has an idea, why the schema is not 
accepted by sax?
kind regards,
 thomas brand


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