<!-- file "http://example.com/abc/sub2.xsd" -->
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"
xmlns:abc="http://example.com/abc"
targetNamespace="http://example.com/abc">
<xsd:element name="sub2-elem " type="xsd:string"/>
<xsd:attribute name="sub2-attr" type="xsd:string"/>
</xsd:schema>