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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>
<xs:element name="date">
<xs:simpleType>
<xs:restriction base="xs:date" xmlns:saxon="http://saxon.sf.net/">
<xs:assertion test=". lt current-date()"
saxon:message="The date must not be in the future"/>
<xs:pattern value="[^Z:]*"
saxon:message="The date must not have a timezone"/>
</xs:restriction>
</xs:simpleType>
</xs:element>
</code>
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