Messages associated with assertions and other facets

In assertions, and on all elements representing facets (for example pattern), Saxon supports the attribute saxon:message="message text". This message text is used in error messages when the assertion or other facet is not satisfied.

For example:

<xs:element name="date"> <xs:simpleType> <xs:restriction base="xs:date" xmlns:saxon=""> <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>