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\title{State Spaces: The Locale Way}
\author{Norbert Schirmer}
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\section{Introduction}
These theories introduce a new command called \isacommand{statespace}.
It's usage is similar to \isacommand{record}s. However, the command does not introduce a new type but an
abstract specification based on the locale infrastructure. This leads
to extra flexibility in composing state space components, in particular
multiple inheritance and renaming of components.
The state space infrastructure basically manages the following things:
\begin{itemize}
\item distinctness of field names
\item projections~/ injections from~/ to an abstract \emph{value} type
\item syntax translations for lookup and update, hiding the projections and injections
\item simplification procedure for lookups~/ updates, similar to records
\end{itemize}
\paragraph{Overview}
In Section \ref{sec:DistinctTreeProver} we define distinctness of the nodes in a binary tree and provide the basic prover tools to support efficient distinctness reasoning for field names managed by
state spaces. The state is represented as a function from (abstract) names to (abstract) values as
introduced in Section \ref{sec:StateFun}. The basic setup for state spaces is in Section
\ref{sec:StateSpaceLocale}. Some syntax for lookup and updates is added in Section \ref{sec:StateSpaceSyntax}. Finally Section \ref{sec:Examples} explains the usage of state spaces by examples.
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