i am new to jaxb and i am trying to unmarshal my first xsd scheme.

i get the following error message:

[ERROR] src-resolve: Cannot resolve the name 'NS0:noNamespaceSchemaLocation'
to a(n) 'attribute declaration' component.
 line 10 of
file:/C:/Dokumente%20und%20Einstellungen/Micha/Eigene%20Dateien/Stammbaum/Stammbaum/xml/Stammbaum.xsd

[ERROR] s4s-elt-invalid-content.1: The content of '#AnonType_root' is
invalid.  Element 'attribute' is invalid, misplaced, or occurs too often.
 line 10 of
file:/C:/Dokumente%20und%20Einstellungen/Micha/Eigene%20Dateien/Stammbaum/Stammbaum/xml/Stammbaum.xsd

the beginning of my xsd file looks like this:

<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
elementFormDefault="qualified"
xmlns:NS0="http://www.w3.org/2001/XMLSchema-instance">
<xs:import namespace="http://www.w3.org/2001/XMLSchema-instance"
schemaLocation="NS0.xsd"/>
<xs:element name="root">
 <xs:complexType>
  <xs:sequence>
   <xs:element ref="Personen"/>
   <xs:element ref="Partnerschaften"/>
  </xs:sequence>
  <xs:attribute ref="NS0:noNamespaceSchemaLocation" use="required"/>
 </xs:complexType>
</xs:element>
<xs:element name="Personen">
 <xs:complexType>
  <xs:sequence>
   <xs:element maxOccurs="unbounded" ref="Person"/>
  </xs:sequence>
 </xs:complexType>
</xs:element>

can anyone please give me some advice what to do about this error message?

thanks for your help
Michael Beckenkamp