Customizing Assert Error Messages

To customize the error messages that the Xerces or Saxon validation engines display for the assert and assertion elements, set the message attribute on these elements. For Xerces, the message attribute has to belong to the http://xerces.apache.org namespace. For Saxon, the message attribute has to belong to the http://saxon.sourceforge.net/ namespace. The value of the message attribute is the error message displayed if the assertion fails.

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