  In algebraic quantum field theory we consider nets of von Neumann algebras
indexed over regions of the space-time. Wiesbrock has shown that strongly
additive nets of von Neumann algebras on the circle are in correspondence with
standard half-sided modular inclusions. We show that a finite index
endomorphism on a half-sided modular inclusion extends to a finite index
endomorphism on the corresponding net of von Neumann algebras on the circle.
Moreover, we present another approach to encoding endomorphisms on nets of
Neumann algebras on the circle into half-sided modular inclusions. There is a
natural way to associate a weight to a Moebius covariant endomorphism. The
properties of this weight has been studied by Bertozzini, Conti and Longo. In
this paper we show the converse, namely how to associate a Moebius covariant
endomorphism to a given weight under certain assumptions, thus obtaining a
correspondence between a class of weights on a half-sided modular inclusion and
a subclass of the Moebius covariant endomorphisms on the associated net of von
Neumann algebras. This allows us to treat Moebius covariant endomorphisms in
terms of weights on half-sided modular inclusions. As our aim is to provide a
framework for treating endomorphisms on nets of von Neumann algebras in terms
of the apparently simpler objects of weights on half-sided modular inclusions,
we lastly give some basic results for manipulations with such weights.
