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      <h1>Messages associated with assertions and other facets</h1>
      <p>In assertions, and on all elements representing facets (for example <code>pattern</code>), 
Saxon supports the attribute <code>saxon:message="message text"</code>.
This message text is used in error messages when the assertion or other facet is not satisfied.</p>
      <p>For example:</p>
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            <code>
  &lt;xs:element name="date"&gt;
    &lt;xs:simpleType&gt;
       &lt;xs:restriction base="xs:date" xmlns:saxon="http://saxon.sf.net/"&gt;
         &lt;xs:assertion test=". lt current-date()"
                    saxon:message="The date must not be in the future"/&gt;
         &lt;xs:pattern value="[^Z:]*" 
                    saxon:message="The date must not have a timezone"/&gt;
       &lt;/xs:restriction&gt;   
    &lt;/xs:simpleType&gt;
  &lt;/xs:element&gt;
</code>
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