PSVI output

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<!--* A partially valid example.
       * 
       * Error messages:

         [Error] po.xml:21:27: Element type "emph" must be declared.

         [Error] po.xml:21:58: The content of element type "comment" must match "null".

         [Error] po.xml:21:58: cvc-type.3.1.2: Element 'comment' is a simple type, so it
         must have no element information item [children].

         [Error] po.xml:23:26: cvc-pattern-valid: Value 'XY-457' is not facet-valid with
         respect to pattern '\d{3}-[A-Z]{2}' for type 'SKU'.

         [Error] po.xml:23:26: cvc-attribute.3: The value 'XY-457' of attribute 
         'partNum' on element 'item' is not valid with respect to its type, 'SKU'.
         
         [Error] po.xml:25:27: cvc-minInclusive-valid: Value '-2' is not 
         facet-valid with respect to minInclusive '1' for type 'null'.

         [Error] po.xml:25:27: cvc-type.3.1.3: The value '-2' of element 'quantity' 
         is not valid.

       *-->
<{http://www.example.com/PO1}purchaseOrder xsi:schemaLocation="http://www.example.com/PO1 po1.xsd">
<{http://www.example.com/PO1}shipTo country="US">
<{http://www.example.com/PO1}name>Martin Swift</{http://www.example.com/PO1}name>
<{http://www.example.com/PO1}street>234 Major Lane</{http://www.example.com/PO1}street>
<{http://www.example.com/PO1}city>Melbourne</{http://www.example.com/PO1}city>
<{http://www.example.com/PO1}state>WA</{http://www.example.com/PO1}state>
<{http://www.example.com/PO1}zip>78345</{http://www.example.com/PO1}zip>
</{http://www.example.com/PO1}shipTo>
<{http://www.example.com/PO1}billTo country="US">
<{http://www.example.com/PO1}name>Maggie Smith</{http://www.example.com/PO1}name>
<{http://www.example.com/PO1}street>345 Fifth</{http://www.example.com/PO1}street>
<{http://www.example.com/PO1}city>New York</{http://www.example.com/PO1}city>
<{http://www.example.com/PO1}state>NY</{http://www.example.com/PO1}state>
<{http://www.example.com/PO1}zip>08540</{http://www.example.com/PO1}zip>
</{http://www.example.com/PO1}billTo>
<{http://www.example.com/PO1}comment>This is a
<{http://www.example.com/PO1}emph>beautiful</{http://www.example.com/PO1}emph>
pen!</{http://www.example.com/PO1}comment>
<{http://www.example.com/PO1}items>
<{http://www.example.com/PO1}item partNum="XY-457">
<{http://www.example.com/PO1}productName>Fountain pen</{http://www.example.com/PO1}productName>
<{http://www.example.com/PO1}quantity>-2</{http://www.example.com/PO1}quantity>
<{http://www.example.com/PO1}USPrice>119.950</{http://www.example.com/PO1}USPrice>
</{http://www.example.com/PO1}item>
</{http://www.example.com/PO1}items>
</{http://www.example.com/PO1}purchaseOrder>