simplified/refined document model: collection of named nodes, without proper dependencies yet;
moved basic type definitions for ids and edits from Isar_Document to Document;
removed begin_document/end_document for now -- nodes emerge via edits;
edits refer to named nodes explicitly;
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\begin{isabellebody}%
\def\isabellecontext{Syntax}%
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\isadelimtheory
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\isakeyword{imports}\ Base\isanewline
\isakeyword{begin}%
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{\isafoldtheory}%
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\isadelimtheory
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\endisadelimtheory
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\isamarkupchapter{Concrete syntax and type-checking%
}
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\begin{isamarkuptext}%
FIXME%
\end{isamarkuptext}%
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\isamarkupsection{Parsing and printing%
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\isamarkuptrue%
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\begin{isamarkuptext}%
FIXME%
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\isamarkupsection{Checking and unchecking \label{sec:term-check}%
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\isadelimtheory
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