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<display>

This statement sends a debugging message to the standard output (both log and console) when the mashup script is processed. Messages can contain both static and dynamic content.

See also <display> Examples.

Can Contain Empty
Allowed In mashup, else, elseif, for, foreach, if, macro, operation, sequence, while,

Attributes

Name Required Description
message yes

The static portion of a debugging message for this mashup script.
expr  

An optional XPath 2.0 expression to provide a dynamic value as part of a debuggning message for this mashup script. You cannot have both an expression and a variable in a debugging message.

variable  

An optional variable to provide a dynamic value as part of a debuggning message for this mashup script. You cannot have both an expression and a variable in a debugging message.

<display> Examples

You define static text for the message in the message attribute. You can also optionally include a dynamic value at the end of the message with either the expr attribute and an XPath 2.0 expression or with the variable attribute which points to a variable. For example:

<display message="testing debugging messages"/> 
<display message="filtered result = " variable="$result"/> 
<display message="sum = " expr = "$firstNum + $secondNum"/>

If you want to turn off debug messages for production, enclose the <display> commands in XML comments, such as:

<!-- <display message="debug message"/> -->

Or remove them from production mashup scripts.