  This technical report relates Biochemical Space Language (BCSL) to Multiset
rewriting systems (MRS). For a BCSL model, the semantics are defined in terms
of transition systems, while for an MRS, they are defined in terms of a set of
runs. In this report, we relate BCSL to MRS by first showing how the transition
system is related to a set of runs and consequently showing how for every BCSL
model, an MRS can be constructed such that both represent the same set of runs.
The motivation of this step is to establish BCSL in the context of a more
general rewriting system and benefit from properties shown for them. Finally,
we show that regulations defined for MRS can be consequently used in the BCSL
model.
