The true type of an object is the type that most accurately describes the object. For example, the input to a C compiler could have the type Plain Text (DRT_TEXT), but would be more accurately described as C Code (DRT_C). C Code would be the true type of this object. Multiple types can be conveyed by using a comma to separate strings. The following figure shows the format to use to convey multiple types:

"type,type..."

The true type should appear first in the list of types, so the type string for the example object would be "C Code, Plain Text".