DataSet and XML Lesson 2

[Jaga]

DataSet & XML Lesson 2
2*complex + 2*simple = 2much ?

Hello,
I have a XSD file with a valid schema (see below).
I can see the schema-diagram in the XML-Designer of VisualStudio well,
but when I call "Schema / DataSet-Preview" it fails with "Undefined
datatype: 'baseTyp'."
Why???

There is no problem (1*complex + 2*simple = OK), if I use
<xs:element name="Elem" type="attribTyp " />
instead of
<xs:element name="Elem" type="elemTyp" />

There is no problem (2*complex + 1*simple = OK), if I use
<xs:attribute name="Attrib" type="baseTyp" />
instead of
<xs:attribute name="Attrib" type="attribTyp " />
There is no problem (2*complex + 1*simple = OK), if I use
<xs:simpleTyp e name="attribTyp ">
<xs:restricti on base="xs:normal izedString">
instead of
<xs:simpleTyp e name="attribTyp ">
<xs:restricti on base="baseTyp">
But there is a problem if I use:

<?xml version="1.0" ?>
<xs:schema targetNamespace ="http://tempuri.org/test2.xsd"
xmlns="http://tempuri.org/test2.xsd"
xmlns:xs="http://www.w3.org/2001/XMLSchema">

<xs:element name="Root">
<xs:complexType >
<xs:sequence>
<xs:element name="Elem" type="elemTyp" />
</xs:sequence>
</xs:complexType>
</xs:element>

<xs:complexTy pe name="elemTyp">
<xs:attribute name="Attrib" type="attribTyp " />
</xs:complexType>

<xs:simpleTyp e name="attribTyp ">
<xs:restricti on base="baseTyp">
<xs:enumerati on value="bottom" />
<xs:enumerati on value="middle" />
<xs:enumerati on value="top" />
</xs:restriction>
</xs:simpleType>

<xs:simpleTyp e name="baseTyp">
<xs:restricti on base="xs:normal izedString" />
</xs:simpleType>

</xs:schema>

thanks,
Jaga