Here you can write your transformation. If you want to use external editor, you can check out it to file on the disk. At the bottom of the page, you can see some transformation expression examples.
Transformation name
The name of the transformation.
Transformation type
You can select transformation type - ASCX or XSLT.
Code
Here you can enter the code of the transformation.
Default transformation button
Using this button will be generated default transformation for the current document type.