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
messageattribute has to belong to thehttp://xerces.apache.orgnamespace. - For Saxon, the
messageattribute has to belong to thehttp://saxon.sourceforge.net/namespace.
message attribute is the error message displayed if
the assertion fails.