PSVI output

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<p:poem xsi:schemaLocation="http://www.example.com/poetry tds.xsd">
<!--* A partially schema-valid example:
* The author element contains undeclared elements.
* Error message:

[Error] theduck.xml:11:16: cvc-complex-type.2.4.c: The matching
wildcard is strict, but no declaration can be found for element
'p:givenname'.

[Error] theduck.xml:12:14: cvc-complex-type.2.4.c: The matching
wildcard is strict, but no declaration can be found for element
'p:surname'.

* Since 'givenname' and 'surname' are not declared,
* they cannot be validated.
* Since 'givenname' and 'surname' do match the wildcard
* in the declaration of 'author', they don't make
* the 'author' element invalid.
*-->
<p:title>The duck</p:title>
<p:author>
<p:givenname>Ogden</p:givenname>
<p:surname>Nash</p:surname>
</p:author>
<p:stanza>
<p:line>It is especially fond</p:line>
<p:line>Of a puddle or pond.</p:line>
<p:line>When it dines or sups</p:line>
<p:line>It bottoms-ups.</p:line>
</p:stanza>
<p:stanza>
<p:line>Behold the duck.</p:line>
<p:line>It does not cluck.</p:line>
<p:line>A cluck it lacks.</p:line>
<p:line>It quacks.</p:line>
</p:stanza>
</p:poem>