  In this paper, we integrate separation logic with Propositional Projection
Temporal Logic (PPTL) to obtain a two-dimensional logic, namely
PPTL$^{\tiny\mbox{SL}}$. The spatial dimension is realized by a decidable
fragment of separation logic which can be used to describe linked lists, and
the temporal dimension is expressed by PPTL. We show that PPTL and
PPTL$^{\tiny\mbox{SL}}$ are closely related in their syntax structures. That
is, for any PPTL$^{\tiny\mbox{SL}}$ formula in a restricted form, there exists
an "isomorphic" PPTL formula. The "isomorphic" PPTL formulas can be obtained by
first an equisatisfiable translation and then an isomorphic mapping. As a
result, existing theory of PPTL, such as decision procedure for satisfiability
and model checking algorithm, can be reused for PPTL$^{\tiny\mbox{SL}}$.
