All reference file settings are contained within flags to indicate the following tokens are for the reference file. The opening flag is <REF> and the closing flag is <\REF>. Multiple reference files can be attached. They are attached in the order they appear in the PPF file.

Inserting a <MASTERFILE> token determines the file update sequence in relation to the master file. Reference files are attached in a sequence before and after the master file.

Table 1. Reference File Tokens

Token	Effect
REF_FILE	Describes the full path and file name of the reference DGN. Format: REF_FILE = c:\reference files\reference.dgn
TREF_LOGICAL	Describes the logical name of the referenced DGN. Format: REF_LOGICAL = Roads
REF_MODEL	Describes the model of the DGN file to be attached. If not defined, the default model is used when making a reference file attachment. Format: REF_MODEL = Bottom
LV	Sets the levels displayed in reference file. Format: LV = Default, Roads, Rivers, Coastline (for v8) or LV = 1,3,6-34,45,46-63 (for MSJ)
<MASTERFILE>	This is a special token that can be placed between <REF> <\REF> pairs. Format:<REF> REF_FILE = "file2" <\REF> <MASTERFILE> <REF> REF_FILE = "file1" <\REF> This example sets an update sequence of "file 2" first, then the master file, lastly followed by "file 1", displaying above the other two files