added ProofContext.tsig_of -- proforma version for local name space only, not logical content;
added ProofContext.read_type_name_proper;
localized ProofContext.read_class/read_arity/cert_arity;
localized ProofContext.class_space/type_space etc.;
theory Isar
imports Base
begin
chapter {* Isar language elements *}
text {*
The primary Isar language consists of three main categories of
language elements:
\begin{enumerate}
\item Proof commands
\item Proof methods
\item Attributes
\end{enumerate}
*}
section {* Proof commands *}
text FIXME
section {* Proof methods *}
text FIXME
section {* Attributes *}
text FIXME
end