There are similar attributes for four entities ine the first goup in FRBR, for example: title. We have title of work, title of expression, etc.. Also there are some instructions for these attributes in RDA.
How could be identified these entities in MODS?

Maliheh Dorkhosh,
MA.student in LIS
Tehran North Branch of IAU
BA LIS Department of Shahed University
Head of cataloging department of the central library and documentation center. University of Tehran