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+#+COLUMNS: %40ITEM %10BEAMER_env(Env) %9BEAMER_envargs(Env Args) %10BEAMER_act(Act) %4BEAMER_col(Col) %10BEAMER_extra(Extra) %8BEAMER_opt(Opt)
+#+TITLE:    Archiving and referencing software source code
+#+SUBTITLE: a glimpse into the software development ecosystem
+# #+AUTHOR: Roberto Di Cosmo
+# #+EMAIL: roberto@dicosmo.org @rdicosmo @swheritage
+#+BEAMER_HEADER: \date{September 24th, 2019}
+#+BEAMER_HEADER: \title[(CC-BY 4.0) Software Source Code]{Archiving and referencing software source code}
+#+BEAMER_HEADER: \author{Roberto Di Cosmo}
+# #+BEAMER_HEADER: \setbeameroption{show notes on second screen}
+#+BEAMER_HEADER: \setbeameroption{hide notes}
+#+KEYWORDS: software heritage legacy preservation knowledge mankind technology
+#+LATEX_HEADER: \usepackage{tcolorbox}
+#+LATEX_HEADER: \definecolor{links}{HTML}{2A1B81}
+#+LATEX_HEADER: \hypersetup{colorlinks,linkcolor=,urlcolor=links}
+
+#
+# prelude.org contains all the information needed to export the main beamer latex source
+# use prelude-toc.org to get the table of contents
+#
+
+#+INCLUDE: "../../common/modules/prelude-toc.org" :minlevel 1
+
+
+#+INCLUDE: "../../common/modules/169.org"
+
+# +LaTeX_CLASS_OPTIONS: [aspectratio=169,handout,xcolor=table]
+
+#+LATEX_HEADER: \usepackage{bbding}
+#+LATEX_HEADER: \DeclareUnicodeCharacter{66D}{\FiveStar}
+
+#
+# If you want to change the title logo it's here
+#
+# +BEAMER_HEADER: \titlegraphic{\includegraphics[width=0.7\textwidth]{SWH-logo}}
+
+# aspect ratio can be changed, but the slides need to be adapted
+# - compute a "resizing factor" for the images (macro for picblocks?)
+#
+# set the background image
+#
+# https://pacoup.com/2011/06/12/list-of-true-169-resolutions/
+#
+#+BEAMER_HEADER: \pgfdeclareimage[height=90mm,width=160mm]{bgd}{swh-world-169.png}
+#+BEAMER_HEADER: \setbeamertemplate{background}{\pgfuseimage{bgd}}
+#+LATEX: \addtocounter{framenumber}{-1}
+* Introduction
+** Short Bio: Roberto Di Cosmo
+ # +BEAMER: \raisebox{-.5\height}{\includegraphics[width=.28\linewidth]{rdc}}
+ Computer Science professor in Paris, now working at INRIA\\
+ - /30 years/ of research (Theor. CS, Programming, Software Engineering, Erdos #: 3)\\
+ - /20 years/ of Free and Open Source Software\\
+ - /10 years/ building and directing structures for the common good\\
+
+ \mbox{}\\
+   \begin{minipage}[c]{0.18\linewidth}
+     \includegraphics[width=1.0\linewidth]{rdc}
+   \end{minipage}
+   \begin{minipage}[c]{0.8\linewidth}
+     \begin{description}
+%       \item[1998] \emph{Cybersnare} -- voice of French FOSS
+       \item[1999] \emph{DemoLinux} -- first live GNU/Linux distro
+%       \item[2004] \emph{EDOS} -- check package dependencies
+       \item[2007] \emph{Free Software Thematic Group}\\
+                   %\tiny{\url{http://www.systematic-paris-region.org/fr/logiciel-libre}}\\
+                   ~150 members ~40 projects ~200Me
+%       \item[2008] \emph{Mancoosi project} \url{www.mancoosi.org}
+%       \item[2010] \emph{IRILL} \url{www.irill.org}
+       \item[2015] \emph{Software Heritage} at INRIA
+       \item[2018] \emph{National Committee for Open Science}, France
+     \end{description}
+   \end{minipage}
+
+# # why software source code is special (2 slides)
+# #
+* Software Source Code and its development process
+** Source code is /special/
+*** /Executable/ and /human readable/ knowledge \hfill copyright law
+    /“Programs must be written for people to read, and only incidentally for machines to execute.”/\\
+    \hfill Harold Abelson
+#+BEAMER: \pause
+*** Software /evolves/ over time
+    - projects may last decades
+    - the /development history/ is key to its /understanding/
+#+BEAMER: \pause
+*** Complexity :B_picblock:
+    :PROPERTIES:
+    :BEAMER_env: picblock
+    :BEAMER_OPT: pic=python3-matplotlib.pdf, width=.6\linewidth
+    :END:
+    - /millions/ of lines of code
+    - large /web of dependencies/
+      + easy to break, difficult to maintain
+    - sophisticated /developer communities/
+** Evolution of software development 
+*** Version control system (VCS)
+    - records changes made to a (set of) source code file(s) 
+    - allows to operate on versions: diff/merge/fork/recover etc.
+    - *essential* tool for software development
+*** Three decades of evolution
+    - Local VCS :: \mbox{}\\
+      RCS (1982)
+    - Centralised VCS :: \mbox{}\\
+      CVS (1990), Subversion (2000)
+    - Distributed VCS :: \mbox{}\\
+      Git (2005), Mercurial (2005), Bazaar (2005)
+** In a picture \hfill (from https://github.com/progit/progit2)
+       #+BEGIN_EXPORT latex
+     	\centering\forcebeamerstart
+     	\only<1>{\colorbox{white}{\includegraphics[width=\extblockscale{.5\linewidth}]{localvcs}}\mbox{}\\[2em]
+        \texttt{co -r1.2 file.c}
+	}
+     	\only<2>{\colorbox{white}{\includegraphics[width=\extblockscale{.5\linewidth}]{centralisedvcs}}\mbox{}\\[2em]
+        \texttt{cvs co -r Rel-1A ProgABC}
+	}
+     	\only<3>{\colorbox{white}{\includegraphics[width=\extblockscale{.5\linewidth}]{distvcs}}\mbox{}\\[2em]
+        \texttt{git checkout df3b1b08f756569eff0919e37d8af1f403515b31}
+	}
+     	\forcebeamerend
+        #+END_EXPORT
+** Foundations of modern DVCS
+**** Requirements for the D in DVCS
+     - *intrinsic* unique identifiers...
+     - ... that work for *tree structures* (software directories)
+     #+BEAMER: \pause
+     # R. C. Merkle, A digital signature based on a conventional encryption
+     # function, Crypto '87
+**** Merkle tree to the rescue (R. C. Merkle, Crypto 1979)       :B_picblock:
+     :PROPERTIES:
+     :BEAMER_opt: pic=merkle, leftpic=true, width=.7\linewidth
+     :BEAMER_env: picblock
+     :BEAMER_act:
+     :END:
+     Combination of 
+      - tree
+      - hash function
+** A worked example 
+  #+LATEX: \centering\forcebeamerstart
+  #+LATEX: \only<1>{\colorbox{white}{\includegraphics[width=\extblockscale{\linewidth}]{git-merkle/merkle_1.pdf}}}
+  #+LATEX: \only<2>{\colorbox{white}{\includegraphics[width=\extblockscale{\linewidth}]{git-merkle/contents.pdf}}}
+  #+LATEX: \only<3>{\colorbox{white}{\includegraphics[width=\extblockscale{\linewidth}]{git-merkle/merkle_2_contents.pdf}}}
+  #+LATEX: \only<4>{\colorbox{white}{\includegraphics[width=\extblockscale{\linewidth}]{git-merkle/directories.pdf}}}
+  #+LATEX: \only<5>{\colorbox{white}{\includegraphics[width=\extblockscale{\linewidth}]{git-merkle/merkle_3_directories.pdf}}}
+  #+LATEX: \only<6>{\colorbox{white}{\includegraphics[width=\extblockscale{\linewidth}]{git-merkle/revisions.pdf}}}
+  #+LATEX: \only<7>{\colorbox{white}{\includegraphics[width=\extblockscale{\linewidth}]{git-merkle/merkle_4_revisions.pdf}}}
+  #+LATEX: \only<8>{\colorbox{white}{\includegraphics[width=\extblockscale{\linewidth}]{git-merkle/releases.pdf}}}
+  #+LATEX: \only<9>{\colorbox{white}{\includegraphics[width=\extblockscale{\linewidth}]{git-merkle/merkle_5_releases.pdf}}}
+  #+LATEX: \only<10>{\colorbox{white}{\includegraphics[width=\extblockscale{\linewidth}]{git-merkle/snapshots.pdf}}}
+  #+LATEX: \forcebeamerend
+** A massive adoption
+*** The GitHub "pull request" model
+    - Bob forks (makes a copy) of Alice's code
+    - Bob modifies (his copy) of the code
+    - Bob requests Alice to pull his changes into her code
+#+BEAMER: \pause
+*** GitHub today
+    - *100.000.000* repositories
+    -  *40.000.000* developers worldwide
+    See https://octoverse.github.com/2017/
+** An exponential growth
+*** /Original/ content grows /exponentially/
+#+latex:\begin{center}\includegraphics[width=\linewidth]{revision_content_growth_wide.png}\end{center}
+* Software Heritage
+** Software Heritage in a nutshell \hfill www.softwareheritage.org
+#+BEAMER: \transdissolve
+#+INCLUDE: "../../common/modules/swh-goals-oneslide-vertical.org::#goals" :only-contents t :minlevel 3
+** Automation, and storage
+   #+BEAMER: \begin{center}
+   #+BEAMER:   \mode<beamer>{\only<1>{\includegraphics[width=\extblockscale{.9\textwidth}]{swh-dataflow-merkle-listers.pdf}}}
+   #+BEAMER:   \only<2-3>{\includegraphics[width=\extblockscale{.9\textwidth}]{swh-dataflow-merkle.pdf}}
+   #+BEAMER: \end{center}
+   #+BEAMER: \pause
+   #+BEAMER: \pause
+   - full development history *permanently archived!*
+
+** The Software Heritage initiative \hfill www.softwareheritage.org :noexport:
+  :PROPERTIES:
+  :CUSTOM_ID: mission
+  :END:
+#+latex: \begin{center}
+#+ATTR_LATEX: :width .5\linewidth
+# file:SWH-logo+motto.pdf
+file:SWH-logo.pdf
+#+latex: \end{center}
+*** Mission
+      \hfill *Collect*, *preserve* and *share* the /source code/ of /all
+      the software/ that is available
+#+BEAMER: \pause
+*** Partners 
+    - Initiator :: Inria
+    - Industry philanthropic sponsors :: VmWare, Société Générale, Intel, GitHub ...
+    - Public sector :: UNESCO, DINSIC, DANS, UQAM, Bologna University
+** Highlights \hfill bit.ly/swhpaper
+*** The largest software source code archive /ever/
+   #+latex: \centering
+   #+latex: \mbox{}\hfill\includegraphics[width=\extblockscale{.35\linewidth}]{swh-dataflow-merkle.pdf}\hfill\pause
+   #+latex: \includegraphics[width=\extblockscale{.75\linewidth}]{2019-09-archive-growth.png}\hfill\mbox{}
+#+BEAMER: \pause
+*** /20 billions intrinsic/ identifiers for reproducibility         :B_block:
+    :PROPERTIES:
+    :BEAMER_env: block
+    :BEAMER_COL: .6
+    :END:
+   Compatible with *git* see \url{bit.ly/swhpidpaper}
+   #+BEAMER: \pause
+*** Research software deposit                              :B_block:noexport:
+    :PROPERTIES:
+    :BEAMER_env: block
+    :BEAMER_COL: .4
+    :END:
+    - [[https://www.softwareheritage.org/2018/09/28/depositing-scientific-software-into-software-heritage/][moderated via *HAL*]]\\
+      \hfill /open since 9/2018/
+*** Reference archive :B_block:
+    :PROPERTIES:
+    :BEAMER_env: block
+    :BEAMER_COL: .4
+    :END:
+    See the work done at \hfill /swmath.org/
+   #+BEAMER: \pause
+*** SWH IDs now a standard for Wikidata
+    \mbox{}\hfill See https://www.wikidata.org/wiki/Property:P6138
+   #+BEAMER: \pause
+*** Collaboration HUB                                      :B_block:noexport:
+    :PROPERTIES:
+    :BEAMER_env: block
+    :BEAMER_COL: .33
+    :END:
+    - industry, research
+    - digital preservation
+*** :B_ignoreheading:
+    :PROPERTIES:
+    :BEAMER_env: ignoreheading
+    :END:
+*** Policy
+   \hfill Now part of the /French National Plan for Open Science/ \hfill\mbox{}
+*** Guidelines                                                     :noexport:
+    https://www.softwareheritage.org/2019/08/05/saving-and-referencing-research-software-in-software-heritage/
+** Software Heritage for Open Science                              :noexport:
+*** A revolutionary infrastructure                               :B_picblock:
+    :PROPERTIES:
+    :BEAMER_env: picblock
+    :BEAMER_OPT: pic=PreservationTriangle.png,leftpic=true, width=.38\linewidth
+    :END:
+      - *universal archive* of all source code
+	+ we archive /all/ software: both research and non research
+	+ we /proactively collect software/ in a systematic way
+      - *intrinsic* identifiers for *reproducibility*
+        + identify software artefacts /without any third party/
+        + cryptographically strong, compatible with git hashes
+      - also *save code now* and *curated deposit* (e.g. via *HAL*)
+*** Guidelines are now available
+    - blog with overview: \hfill http://bit.ly/blogsaveres
+    - full details: \hfill http://bit.ly/swhsaveguide
+#     https://www.softwareheritage.org/2019/08/05/saving-and-referencing-research-software-in-software-heritage/
+#     https://annex.softwareheritage.org/public/guidelines/archive-research-software.pdf
+** Software Heritage for Research and Innovation                   :noexport:
+*** Reference platform for /Big Code/                            :B_picblock:
+    :PROPERTIES:
+    :BEAMER_opt: pic=universal, leftpic=true, width=.2\linewidth
+    :BEAMER_env: picblock
+    :BEAMER_act:
+    :END:
+   - unique *observatory* of all software development 
+   - *big data, machine learning* paradise: classification, trends, coding patterns, code completion...
+#+BEAMER: \pause
+*** First datasets are available!
+   - full graph of software development (~20Bn nodes, ~200Bn edges)
+     see Pietri, Spinellis, Zacchiroli, MSR 2019 https://dx.doi.org/10.1109/MSR.2019.00030
+   - MSR 2020 mining competition
+     see https://2020.msrconf.org/track/msr-2020-mining-challenge#Call-for-Papers
+** Demo time
+*** Exploring the archive
+   - [[https://www.softwareheritage.org/2019/07/20/archiving-and-referencing-the-apollo-source-code/][Apollo 11]]
+   - [[https://archive.softwareheritage.org/swh:1:cnt:bb0faf6919fc60636b2696f32ec9b3c2adb247fe;origin=https://github.com/id-Software/Quake-III-Arena;lines=548-572/][Quake III Arena]]
+*** Feature highlights
+   - [[https://archive.softwareheritage.org/save/][Save code now]]
+*** Archive interconnect
+   - [[https://swmath.org/software/7116][SemiPar on swmath.org]]
+** Conclusion
+***                                                         :B_ignoreheading:
+    :PROPERTIES:
+    :BEAMER_env: ignoreheading
+    :END:
+#+latex:    \hfill {\Large\bf Thank you!} \hfill\mbox{}
+  #+BEGIN_EXPORT latex
+  \begin{thebibliography}{Foo Bar, 1969}
+  \footnotesize
+
+  \bibitem{Abramatic2018} Jean-François Abramatic, Roberto Di Cosmo, Stefano Zacchiroli\newblock
+  Building the Universal Archive of Source Code\newblock
+  Communications of the ACM, October 2018
+
+  \bibitem{DiCosmo2018} Roberto Di Cosmo, Morane Gruenpeter, Stefano Zacchiroli\newblock
+  Identifiers for Digital Objects: the Case of Software Source Code Preservation\newblock
+  iPRES 2018: Intl. Conf. on Digital Preservation
+  \end{thebibliography}
+  #+END_EXPORT
+* Appendix :B_appendix:
+  :PROPERTIES:
+  :BEAMER_env: appendix
+  :END:
+** 
+   \vfill
+   \centerline{\Huge Appendix}
+   \vfill
+* The SWH IDentifier schema
+#+INCLUDE: "../../common/modules/swh-pids.org::#swhexamples" :minlevel 2
+** Software Source code: pillar of Open Science                    :noexport:
+*** Software is everywhere in modern research                    :B_picblock:
+    :PROPERTIES:
+    :BEAMER_opt: pic=papermountain, leftpic=true, width=.3\linewidth
+    :BEAMER_env: picblock
+    :BEAMER_COL: .6
+    :END:
+#+BEGIN_QUOTE
+[...] software [...] essential in their fields.
+
+\mbox{}\hfill Top 100 papers (Nature, 2014)
+#+END_QUOTE
+#+BEGIN_QUOTE
+Sometimes, if you dont have the software, you dont have the data
+
+\mbox{}\hfill Christine Borgman, Paris, 2018
+#+END_QUOTE
+# http://www.nature.com/news/the-top-100-papers-1.16224
+#+BEAMER: \pause
+*** Open Science: three pillars                                     :B_block:
+    :PROPERTIES:
+    :BEAMER_COL: .45
+    :BEAMER_env: block
+    :END:
+#+latex: \begin{center}
+#+ATTR_LATEX: :width \extblockscale{\linewidth}
+file:PreservationTriangle.png
+#+latex: \end{center}
+#+BEAMER: \pause
+*** :B_ignoreheading:
+    :PROPERTIES:
+    :BEAMER_env: ignoreheading
+    :END:
+*** Nota bene
+    \hfill The links in the picture are *essential*
+** The state of the art is not ideal                               :noexport:
+#+INCLUDE: "../../common/modules/reprod-bad-sota.org::#collbergmethod" :only-contents t :minlevel 3
+** ... cont'd                                                      :noexport:
+#+INCLUDE: "../../common/modules/reprod-bad-sota.org::#collbergfindings" :only-contents t :minlevel 3
+#+BEAMER: \pause
+*** The main reasons
+    \hfill source code (/or the right version of it/) cannot be found
+** Pressure to make the source code available is raising           :noexport:
+*** Why
+   Necessary to 
+    - /reproduce/ and verify,
+    - /modify/ and /evolve/, *building new experiments* from old ones
+#+BEAMER: \pause
+*** When and where
+    - debate started end of first 2000 decade (biology, statistics, medicine, etc.)
+    - growing in Computer Science since the [[https://www.artifact-eval.org/about.html][ESEC/FSE 2011 Artifact Evaluation context]] (winner: Vouillon and Di Cosmo)
+
+** Where we stand                                                  :noexport:
+*** A wealth of initiatives!
+   - Policies: ACM [[https://www.acm.org/publications/policies/artifact-review-badging][Artifact Review and Badging]], ...
+   - Working groups: [[https://www.force11.org/software-citation-principles][FORCE11]], [[https://www.rd-alliance.org/groups/software-source-code-ig][RDA]], [[https://www.ouvrirlascience.fr/logiciels-libres-et-open-source/][SPSO]], ...
+   - Metrics: [[https://www.ouvrirlascience.fr/about-the-proposal-for-software-indicators-in-open-science-monitor-3/][Open Science Monitor]] (Elsevier!), ...
+   - Journals: [[https://www.ipol.im/][IPOL]], ReScience, InsightJournal, eLife, ACM DL, ...
+   - Repositories: FigShare, Zenodo, ...
+#+BEAMER: \pause
+*** 
+    \hfill but ... \hfill \mbox{}
+*** Lack of recognition 
+    :PROPERTIES:
+    :BEAMER_env: block
+    :BEAMER_COL: .5
+    :END:
+    not (yet) a first class citizen
+    - in the EOSC plan
+#    - in the EU copyright reform
+    - in the scholarly works
+#+BEAMER: \pause
+*** Lack of proper guidance on how to
+    :PROPERTIES:
+    :BEAMER_env: block
+    :BEAMER_COL: .5
+    :END:
+    - /archive/ and /reference/ software
+    - choose a license
+    - /cite/ a software project
+# #+BEAMER: \pause
+# *** :B_ignoreheading:
+#     :PROPERTIES:
+#     :BEAMER_env: ignoreheading
+#     :END:
+# *** Lack of basic prerequisites to reproducibility
+#     See a discussion in \url{annex.softwareheritage.org/talks/2018/2018-09-17-STScI_public.pdf} 
+
+** ACM take on Reproducibility, Replicability and Source code      :noexport:
+    ACM policies: [[https://www.acm.org/publications/policies/artifact-review-badging][Artifact Review and Badging]]
+*** Terminology (not consensual yet!)
+    :PROPERTIES:
+    :BEAMER_col: 0.5
+    :BEAMER_env: block
+    :END:     
+    - *Repeatability* \\ same team, same experimental setup
+    - *Replicability* \\ different team, same experimental setup
+    - *Reproducibility* \\ different team, different experimental setup
+#+BEAMER: \pause
+*** Badging software artefacts
+    :PROPERTIES:
+    :BEAMER_col: 0.4
+    :BEAMER_env: block
+    :END:
+#+latex: \begin{center}
+   #+ATTR_LATEX: :width 0.6\linewidth
+# file:file:metadata_landscape_final.png
+file:acm_badges.png
+#+latex: \end{center}
+#+BEAMER: \pause
+
+** What is at stake \hfill in increasing order of difficulty       :noexport:
+*** Archival
+    Research software artifacts must be properly *archived*\\
+    \hfill make it sure we can /retrieve/ them (/reproducibility/)
+#+BEAMER: \pause
+*** Identification
+    Research software artifacts must be properly *referenced*\\
+    \hfill make it sure we can /identify/ them (/reproducibility/)
+#+BEAMER: \pause
+*** Metadata
+    Research software artifacts must be properly *described*\\
+    \hfill make it easy to /discover/ them (/visibility/)
+#+BEAMER: \pause
+*** Citation
+    Research software artifacts must be properly *cited* /(not the same as referenced!)/\\
+    \hfill to give /credit/ to authors (/evaluation/!)
+* Towards Software Citation                                        :noexport:
+** Context
+*** Many articles/guidelines                                        :B_block:
+    :PROPERTIES:
+    :BEAMER_env: block
+    :BEAMER_COL: .4
+    :END:
+     - reproducibility
+     - archival
+     - credit and evaluation
+#+BEAMER: \pause
+*** Most common limitations :B_block:
+    :PROPERTIES:
+    :BEAMER_env: block
+    :BEAMER_COL: .6
+    :END:
+     - software is 'just data'
+     - citation = reference = DOIs
+     - citation produced by automated tools
+#+BEAMER: \pause
+*** :B_ignoreheading:
+    :PROPERTIES:
+    :BEAMER_env: ignoreheading
+    :END:
+*** A few remarkable exceptions
+     - [[https://www.ascl.net][ASCL]] (since 1999): metadata only, carefully curated
+     - [[https://www.geodynamics.org][geodynamics.org]] : source, documentation, metadata
+     - [[https://swmath.org][swmath.org]] : software catalog via articles
+#+BEAMER: \pause
+*** Software Citation WG at Inria (since 10/2018)
+    - leverage a 50 year experience, make recommendations
+    - read more https://hal.archives-ouvertes.fr/hal-02135891
+** Why it is not simple
+*** Software is complex
+ - Structure :: monolithic/composite; self-contained/external dependencies
+ - Lifetime :: one-shot/long term
+ - Community :: one man/one team/distributed community
+ - Authorship :: complex set of roles /(more later)/
+ - Authority :: institutions/organizations/communities/single person
+#+BEAMER: \pause
+*** Various granularities
+ - Exact status of the source code :: for reproducibility, e.g.
+#+latex:            \emph{``you can find at \href{https://archive.softwareheritage.org/swh:1:cnt:cdf19c4487c43c76f3612557d4dc61f9131790a4;lines=146-187/}{swh:1:cnt:cdf19c4487c43c76f3612557d4dc61f9131790a4;lines=146-187} the core algorithm used in this article''}
+
+ - (Major) release :: \emph{``This functionality is available in OCaml version 4''}
+
+ - Project :: \emph{``Inria has created OCaml and Scikit-Learn''}.
+** Proposals for the scholarly world
+*** Refined ontology for contributors                               :B_block:
+    :PROPERTIES:
+    :BEAMER_COL: .55
+    :BEAMER_env: block
+    :END:
+    - Design, Architecture, 
+    - Coding, Testing, Debugging,
+    - Documentation, Maintenance, Support,
+    - Management
+    \hfill see also [[https://www.casrai.org/credit.html][CRediT]], [[https://geodynamics.org/cig/metadata/?software=aspect&version=2.1.0][Geodynamics]]
+#+BEAMER: \pause
+*** Reference is distinct from citation :B_block:
+    :PROPERTIES:
+    :BEAMER_COL: .5
+    :BEAMER_env: block
+    :END:
+    - *Reference* is for /reproducibility/
+    - *Citation* is for /credit/
+    \hfill They must not be conflated
+    - Beware :: of the numbers game:
+    \hfill ... do we really want an /s-index/ ?
+*** :B_ignoreheading:
+    :PROPERTIES:
+    :BEAMER_env: ignoreheading
+    :END:
+#+BEAMER: \pause
+*** Keep the human in the loop :B_block:
+    :PROPERTIES:
+    :BEAMER_env: block
+    :END:
+    When /credit/ is at stake, automation/crowdsourcing is not enough!\\
+    \hfill Humans /are needed/ to get /quality information/
+** Inria's ongoing contributions
+*** Software Heritage
+    - universal archive :: (research) software source code [[https://archive.softwareheritage.org/][archived and referenced]]
+*** Reproducibility
+    - tools :: [[https://www.gnu.org/software/guix/][Guix]] (now [[https://www.softwareheritage.org/2019/04/18/software-heritage-and-gnu-guix-join-forces-to-enable-long-term-reproducibility/][with Software Heritage]])
+    - training/research :: RR workshops, MOOC
+*** Research software curation
+    - HAL - SWH bridge :: curation of metadata, and [[https://hal.inria.fr/hal-01872189][deposit in Software Heritage]]
+* Under the hood                                                   :noexport:
+** Automation, and storage                                        :maybemove:
+   #+BEAMER: \begin{center}
+   #+BEAMER:   \mode<beamer>{\only<1>{\includegraphics[width=\extblockscale{.9\textwidth}]{swh-dataflow-merkle-listers.pdf}}}
+   #+BEAMER:   \only<2-3>{\includegraphics[width=\extblockscale{.9\textwidth}]{swh-dataflow-merkle.pdf}}
+   #+BEAMER: \end{center}
+   #+BEAMER: \pause
+   #+BEAMER: \pause
+   - full development history *permanently archived!*
+
+** The archive in pictures                                         :noexport:
+    #+LATEX: \centering\forcebeamerstart
+    #+LATEX: \only<1>{\colorbox{white}{\includegraphics[width=\extblockscale{\linewidth}]{git-merkle/merkle_1.pdf}}}
+    #+LATEX: \only<2>{\colorbox{white}{\includegraphics[width=\extblockscale{\linewidth}]{git-merkle/contents.pdf}}}
+    #+LATEX: \only<3>{\colorbox{white}{\includegraphics[width=\extblockscale{\linewidth}]{git-merkle/merkle_2_contents.pdf}}}
+    #+LATEX: \only<4>{\colorbox{white}{\includegraphics[width=\extblockscale{\linewidth}]{git-merkle/directories.pdf}}}
+    #+LATEX: \only<5>{\colorbox{white}{\includegraphics[width=\extblockscale{\linewidth}]{git-merkle/merkle_3_directories.pdf}}}
+    #+LATEX: \only<6>{\colorbox{white}{\includegraphics[width=\extblockscale{\linewidth}]{git-merkle/revisions.pdf}}}
+    #+LATEX: \only<7>{\colorbox{white}{\includegraphics[width=\extblockscale{\linewidth}]{git-merkle/merkle_4_revisions.pdf}}}
+    #+LATEX: \only<8>{\colorbox{white}{\includegraphics[width=\extblockscale{\linewidth}]{git-merkle/releases.pdf}}}
+    #+LATEX: \only<9>{\colorbox{white}{\includegraphics[width=\extblockscale{\linewidth}]{git-merkle/merkle_5_releases.pdf}}}
+    #+LATEX: \only<10>{\colorbox{white}{\includegraphics[width=\extblockscale{\linewidth}]{git-merkle/snapshots.pdf}}}
+    #+LATEX: \forcebeamerend
+** A bird's eye view                                               :noexport:
+    #+BEAMER: \begin{center}
+    #+BEAMER:  \includegraphics[width=\extblockscale{1.3\textwidth}]{swh-merkle-dag-wide.pdf}
+    #+BEAMER: \end{center}
+* Identifiers are not easy                                         :noexport:
+** URL decay disrupts the /web of reference/
+ #+INCLUDE: "../../common/modules/urls-decay.org::#rfc" :minlevel 3 :only-contents t
+ #+INCLUDE: "../../common/modules/urls-decay.org::#examples" :minlevel 2
+** DOI limitations
+ #+INCLUDE: "../../common/modules/doi-analysis.org::#doiexplained" :minlevel 3 :only-contents t
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