For some onion.net projects, onion.net is a completely sufficient system to record and administrate information. In most projects, however, data is to be processed in a specific way, e. g. as HTML or PDF output. This task is performed by transformation developers via the onion.net render engine components. They create methods for transforming data into the desired type of output.
Transformation developers can create a preview for every object type. In this preview, data will be processed and displayed in any specific way defined by the transformation developer.
If a preview is available for objects of a type, then a preview button will appear over the context menu of the object. The preview opens in a new window.