XREF (Background) Files
9 characters maximum (not including filetype extension)
Standard: XPPA-DTTLL
X PP A(-) D TT LL
X: Identified the file as a Model file to be XREFed to other files.
PP-: Project identifier (2 characters) (Optional)
A: Phase identifier (Optional) (1 character or “-“ (hyphen))
D: Discipline (1 character)
TT: File type (2 character)
LL: Floor/series identifier (2 character)
Examples:
XPC-AFP01.dwg
Pima County, Architectural, Floor Plan, First floor
XPC-CSP01.dwg
Pima County, Civil, [...]
Continue reading about CAD Standards – Example File Names – XREF
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