\section{ARRAU 3: Summary of the Revisions}
\label{sec:ARRAU3}

% Plan for this Section: summarize the upgrades, discussed in more detail in the following Sections
% \begin{itemize}
%     \item anno scheme
%     \item infrastructure
% \end{itemize}

The {\CRAC} 2018 shared task revealed a number of issues with the {\ARRAU} 2 annotation - first of all with the annotation of bridging references and discourse deixis- that prompted a first round of revisions to the annotation scheme and the annotation guidelines. 
More issues about the annotation of anaphoric reference in dialogue were revealed when the data were used for the {\CODICRAC} 2021 shared task, resulting in a second round of revisions. 
During the {\CODICRAC} shared task we also discovered issues with tokenization and with the way the {\RST} portion had been converted. 
As a result, we started revising the corpus by: 
(i) revising annotation schemee and guidelines 
(ii) fixing the issues with tokenization and with conversion.
%
% Cut to save space
% \begin{enumerate}
%     \item The issues with tokenization and with conversion were fixed.
%     \item The annotation scheme and guidelines were revised in several respects. 
%     % Two key revisions were   
%     % (i) requiring the annotation of all bridging references and of bridging relations for all corpora  and 
%     % (ii) requiring the annotation of first and second person pronouns in the {\TRAINS} corpora.
%     % But a number of other revisions were also planned, as discussed next.
%     The entire corpus was checked and revised to be consistent with the new guidelines.
% \end{enumerate}
In the following two sections, we discuss each of these revisions in detail.


% \paragraph{Annotation scheme} Following the {\CRAC} 2018 shared task, a revised version of the annotation guidelines was produced.\footnote{\url{https://github.com/arrauproject/data/blob/main/ARRAU_3_Annotation_Manual_1.0.pdf}}
% The new guidelines were used  to check the annotation of  the documents already annotated for {\CODICRAC} 2021 and 2022 and to annotate new data. 
% The new guidelines are discussed in detail in Section \ref{sec:upgrade:annotation}.

% \paragraph{Tokenization and Initial Conversion }
% A very simple form of tokenization was used when the initial base layer was created. 
% We also found that a number of errors had been introduced when the documents in the {\RST} portion of the corpus were created from the original \ACRO{prd} format. 
% The steps we took to correct tokenization and conversion errors are discussed in Section \ref{sec:corrections}.
