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.

<{}purchaseOrder xsi:schemaLocation=" po1.xsd">
<{}shipTo country="US">
<{}name>Martin Swift</{}name>
<{}street>234 Major Lane</{}street>
<{}billTo country="US">
<{}name>Maggie Smith</{}name>
<{}street>345 Fifth</{}street>
<{}city>New York</{}city>
<{}comment>This is a
<{}item partNum="XY-457">
<{}productName>Fountain pen</{}productName>