Echoes a message to System.out or a file.
| Attribute | Description | Required |
| message | the message to echo. | Yes, unless data is included in a character section within this element. |
| file | the file to write the message to. | No |
| append | Append to an existing file? | No - default is false. |
<echo message="Hello world"/>
<echo> This is a longer message stretching over two lines. </echo>
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