Thanks for the info samtregar maybe you will be kind enough to help me out somemore? Here's what i got going so far ...

bash-2.03$ cat perl_xml_schema.pl 
#!/usr/local/bin/perl -w
use strict;
use XML::SAX::ParserFactory;
use XML::Validator::Schema;
 
sub usage {
        return "$0 <xml> <xsd>\n";
} 
my $xml = shift || die usage; 
my $xsd = shift || die usage; 
#
# create a new validator object, using foo.xsd
#
my $validator = XML::Validator::Schema->new(file => $xsd);
 
#
# create a SAX parser and assign the validator as a Handler
#
my $parser = XML::SAX::ParserFactory->parser(Handler => $validator);
 
#
# validate foo.xml against foo.xsd
#
eval { $parser->parse_uri($xml) }; die "File failed validation: $@" if
+ $@;
bash-2.03$ cat XML/invoice.xml 
<?xml version="1.0"?>
 
<invoice xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
xsi:noNamespaceSchemaLocation="XML/simpleInvoice.xsd">
   <invoiceNumber>A1112CD</invoiceNumber>
   <originator>
      <companyName>Metaphorical Web</companyName>
      <companyContact>James Eldridge</companyContact>
      <companyIdentifier>MetWeb</companyIdentifier>
   </originator>
   <receiver>
      <companyName>Semantic Web</companyName>
      <companyContact>Sarah Tremaine</companyContact>
<companyIdentifier>SemanticWeb</companyIdentifier>
 
   </receiver>
   <lineItems>
      <lineItem>
         <itemDescription>Essay on Metaphorical 
           Web</itemDescription>
         <itemCount>1</itemCount>
         <itemUnit>Article</itemUnit>
         <itemPrice currency="USD">155.60</itemPrice>
         <itemTotal currency="USD">155.60</itemTotal>
      </lineItem>
      <lineItem>
         <itemDescription>Lesson Package
           </itemDescription>
         <itemCount>4</itemCount>
         <itemUnit>Lesson</itemUnit>
         <itemPrice currency="USD">176.13</itemPrice>
         <itemTotal currency="USD">704.52</itemTotal>
      </lineItem>
   </lineItems>
   <total>860.12</total>
</invoice>
bash-2.03$ cat XML/simpleInvoice.xsd 
<!-- simpleInvoice.xsd -->
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">
 
 <xsd:element name="invoiceNumber" type="xsd:string">
 </xsd:element>
 
 <xsd:element name="originator">
  <xsd:complexType>
   <xsd:sequence>
    <xsd:element ref="companyName"/>
    <xsd:element ref="companyContact"/>
    <xsd:element ref="companyIdentifier"/>
   </xsd:sequence>
  </xsd:complexType>
 </xsd:element>
 
 <xsd:element name="companyName" type="xsd:string">
 </xsd:element>
 
 <xsd:element name="companyContact" type="xsd:string">
 </xsd:element>
 
 <xsd:element name="companyIdentifier" type="xsd:string">
 </xsd:element>
 
 <xsd:element name="receiver">
  <xsd:complexType>
   <xsd:sequence>
    <xsd:element ref="companyName"/>
    <xsd:element ref="companyContact"/>
    <xsd:element ref="companyIdentifier"/>
   </xsd:sequence>
  </xsd:complexType>
 </xsd:element>
 
 <xsd:element name="itemDescription" type="xsd:string">
 </xsd:element>
 
 <xsd:element name="itemCount" type="xsd:string">
 </xsd:element>
 
 <xsd:element name="itemUnit" type="xsd:string">
 </xsd:element>
 
 <xsd:element name="itemPrice">
  <xsd:complexType>
  <xsd:simpleContent>
  <xsd:extension base="xsd:string">
   <xsd:attribute name="currency" 
    type="xsd:string" use="required"/>
   </xsd:extension>
   </xsd:simpleContent>
  </xsd:complexType>
 </xsd:element>
 
 <xsd:element name="itemTotal">
  <xsd:complexType>
  <xsd:simpleContent>
  <xsd:extension base="xsd:string">
   <xsd:attribute name="currency" 
    type="xsd:string" use="required"/>
   </xsd:extension>
   </xsd:simpleContent>
  </xsd:complexType>
 </xsd:element>
 
 <xsd:element name="lineItem">
  <xsd:complexType>
   <xsd:sequence>
    <xsd:element ref="itemDescription"/>
    <xsd:element ref="itemCount"/>
    <xsd:element ref="itemUnit"/>
    <xsd:element ref="itemPrice"/>
    <xsd:element ref="itemTotal"/>
   </xsd:sequence>
  </xsd:complexType>
 </xsd:element>
 
 <xsd:element name="lineItems">
  <xsd:complexType>
   <xsd:sequence maxOccurs="unbounded">
    <xsd:element ref="lineItem"/>
   </xsd:sequence>
  </xsd:complexType>
 </xsd:element>
 
 <xsd:element name="total" type="xsd:string">
 </xsd:element>
 
 <xsd:element name="invoice">
  <xsd:complexType>
   <xsd:sequence>
    <xsd:element ref="invoiceNumber"/>
    <xsd:element ref="originator"/>
    <xsd:element ref="receiver"/>
    <xsd:element ref="lineItems"/>
    <xsd:element ref="total"/>
   </xsd:sequence>
  </xsd:complexType>
 </xsd:element>
</xsd:schema>
[download]

Now when i run my script I get this ...

bash-2.03$ ./perl_xml_schema.pl XML/invoice.xml XML/simpleInvoice.xsd 
Found element without a name.
bash-2.03$ ls -l >junk
bash-2.03$ ./perl_xml_schema.pl junk XML/simpleInvoice.xsd 
Found element without a name.
[download]

What's going on here?