The assign-source function assigns a new value to a given information source. This function permits editing during the filtering process. The function can assign an explicit new value, or it can copy a value from another information source.
Name of the source whose value is to be change
Specifies an explicit value
Information source to copy to dst
You must specify either a value property or a srcproperty, but not both.
Data fn=assign-source dst=type src=content-type