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Use the Definition tab to specify the message text and the names and types of parameters. The message text can include placeholder marks for parameter values.
| Field | Description | 
| Message | Enter the text of the message as a skeleton, with placeholders in curly braces for parameters, as {1}, {2} and so on. When this message rule is evaluated, text values for each parameter can be supplied, separated by the delimiter \t to indicate a tab character. The value may be a property reference, a JSP tag result, or a constant. 
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| Message Parameters | 
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| Parameter | Enter an arbitrary but unique alphabetic text label for each parameter. | 
| Type | Select an expected type for this parameter from the selection list. The Type determines how the parameter is recognized and processed: 
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| Default | Optional. Enter a default value for the parameter, as text. The system uses this value if the call to assemble the message does not provide a value for this parameter. |