Preserving the World's Software: A Hands-On Introduction to Software Heritage

Preserving the World’s Software A Hands-On Introduction to Software Heritage Jaime Arias Research Engineer CNRS, LIPN, Université Sorbonne Paris Nord November 4, 2025 THE GREAT LIBRARY OF SOURC E CODE Jaime Arias [email protected] (CC-BY 4.0) A Hands-On Introduction to Software Heritage November 4, 2025 1 / 1 Who am I? Hello! IamJaime Arias CNRS Research Engineer @ LIPN Ambassador @Software Heritage Member @Collège Codes Sources et Logiciels Chargé de mission Logiciels @CNRS Sciences Info You can find me at: %[email protected] https://www.jaime-arias.fr Jaime Arias [email protected] (CC-BY 4.0) A Hands-On Introduction to Software Heritage November 4, 2025 1 / 1 TL;DR Jaime Arias [email protected] (CC-BY 4.0) A Hands-On Introduction to Software Heritage November 4, 2025 2 / 1 TL;DR Jaime Arias [email protected] (CC-BY 4.0) A Hands-On Introduction to Software Heritage November 4, 2025 2 / 1 Software is a pillar of Open Science French Open Science Monitor 2025 Jaime Arias [email protected] (CC-BY 4.0) A Hands-On Introduction to Software Heritage November 4, 2025 3 / 1 Software is a pillar of Open Science French Open Science Monitor 2025 Jaime Arias [email protected] (CC-BY 4.0) A Hands-On Introduction to Software Heritage November 4, 2025 4 / 1 Source code is special (software is not data) Software evolves over time projects may last decades the development history is key to its understanding Complexity millions of lines of code large web of dependencies easy to break, difficult to maintain research software a thin top layer sophisticated developer communities python3-matplotlib python3-dateutil python3-six (>= 1.4) python3:any python-matplotlib-data (>= 3.0.2-2) python3-pyparsing (>= 1.5.6) libjs-jquery libjs-jquery-ui python3-numpy (>= 1:1.14.3) python3 (<< 3.8) (>= 3.7~) python3-numpy-abi9 python3-cycler (>= 0.10.0) python3-kiwisolver libfreetype6 (>= 2.2.1) libpng16-16 (>= 1.6.2-1) python3-pil python3-tk (>= 1.5) (>= 3.2~) tzdata [python3] [python3] {debconf} debconf-2.0 (>= 0.5) [debconf] {cdebconf} fonts-lyx ttf-bitstream-vera (>= 3.3.2-2~) jquery javascript-common (>= 1.7) (<< 3.8)(>= 3.7~)python3.7:any libblas3 libblas.so.3 liblapack3 liblapack.so.3python3-pkg-resources python3-minimal (= 3.7.3-1) python3.7 (>= 3.7.3-1~) libpython3-stdlib (= 3.7.3-1) python3.7-minimal (>= 3.7.3-1~) {dpkg} install-info (>= 1.13.20) libpython3.7-minimal (= 3.7.3-2) libexpat1 (>= 2.1~beta3) libssl1.1 (>= 1.1.1) libpython3.7-stdlib (>= 0.5) (= 3.7.3-2) mime-support libbz2-1.0 liblzma5 (>= 5.1.1alpha+20120614) libdb5.3 libffi6 (>= 3.0.4) libmpdec2 libncursesw6 (>= 6) libtinfo6 (>= 6) libreadline7 (>= 7.0~beta) libsqlite3-0 (>= 3.7.15) libuuid1 (>= 2.20.1) bzip2file xz-utils (= 1.0.6-9) libmagic1 (= 1:5.35-4) libmagic-mgc (= 1:5.35-4) (>= 5.2.2)xz-lzma (= 6.1+20181013-2) libgpm2 (>= 6) readline-common (>= 1.15.4) libreadline-common (>= 1.16.1) uuid-runtime (>= 2.25-5~) (>= 2.31.1) adduserlibsmartcols1 (>= 2.27~rc1) libsystemd0 (>= 0.5) passwd (>= 5.1.1alpha+20120614) libgcrypt20 (>= 1.8.0) liblz4-1 (>= 0.0~r122) libgpg-error0 (>= 1.25) libgpg-error-l10n (= 3.7.3-2) (= 3.7.3-2) (>= 3.7.3-1~) [python3.7] [python3.7] libgfortran5 (>= 8) libquadmath0 (>= 4.6) ... -6gcc-9-base (= 9-20190428-1) (>= 4.6) (= 9-20190428-1) (>= 8) (>= 4.6) ... -3- (>= 3.3.2-2~) (<< 3.8)(>= 3.6~) (>= 1.6.2-1) (<< 3.8) (>= 3.7~) (>= 2.2.1) [mime-support] python3-pil.imagetk libimagequant0 (>= 2.11.10) libjpeg62-turbo (>= 1.3.1) liblcms2-2 (>= 2.2+git20110628) libtiff5 (>= 4.0.3) libwebp6 (>= 0.5.1) libwebpdemux2 (>= 0.5.1) libwebpmux3 (>= 0.6.1-2) python3-olefile (<< 3.8)(>= 3.7~) (= 6.0.0-1) (>= 3.4.1-2) (>= 3.7.1-1~)(<< 3.9) blt (>= 2.4z-9) tk8.6-blt2.5 (>= 2.5.3) libtcl8.6 (>= 8.6.0) libtk8.6 (>= 8.6.0)(= 2.5.3+dfsg-5) (>= 8.6.0) (>= 8.6.0) blt4.2blt8.0 blt8.0-unoff (>= 2.2.1) (>= 8.6.0-2) libfontconfig1 (>= 2.12.6) libxext6 libxft2 (>> 2.1.1) libxss1 (>= 2.3.5)(>= 2.12.6) libxrender1 x11-common libjpeg62 (>= 5.1.1alpha+20120614) (>= 1.3.1) libjbig0 (>= 2.0) (>= 0.5.1) libzstd1 (>= 1.3.2) (>= 0.5.1)(>= 0.5.1) Matplotlib library Python dependencies Real dependencies Fake OS dependencies induced by package granularity The human side design, algorithm, code, test, documentation, community, funding and so many more facets ... Jaime Arias [email protected] (CC-BY 4.0) A Hands-On Introduction to Software Heritage November 4, 2025 5 / 1 Source code is special (software is not data) Software evolves over time projects may last decades the development history is key to its understanding Complexity millions of lines of code large web of dependencies easy to break, difficult to maintain research software a thin top layer sophisticated developer communities python3-matplotlib python3-dateutil python3-six (>= 1.4) python3:any python-matplotlib-data (>= 3.0.2-2) python3-pyparsing (>= 1.5.6) libjs-jquery libjs-jquery-ui python3-numpy (>= 1:1.14.3) python3 (<< 3.8) (>= 3.7~) python3-numpy-abi9 python3-cycler (>= 0.10.0) python3-kiwisolver libfreetype6 (>= 2.2.1) libpng16-16 (>= 1.6.2-1) python3-pil python3-tk (>= 1.5) (>= 3.2~) tzdata [python3] [python3] {debconf} debconf-2.0 (>= 0.5) [debconf] {cdebconf} fonts-lyx ttf-bitstream-vera (>= 3.3.2-2~) jquery javascript-common (>= 1.7) (<< 3.8)(>= 3.7~)python3.7:any libblas3 libblas.so.3 liblapack3 liblapack.so.3python3-pkg-resources python3-minimal (= 3.7.3-1) python3.7 (>= 3.7.3-1~) libpython3-stdlib (= 3.7.3-1) python3.7-minimal (>= 3.7.3-1~) {dpkg} install-info (>= 1.13.20) libpython3.7-minimal (= 3.7.3-2) libexpat1 (>= 2.1~beta3) libssl1.1 (>= 1.1.1) libpython3.7-stdlib (>= 0.5) (= 3.7.3-2) mime-support libbz2-1.0 liblzma5 (>= 5.1.1alpha+20120614) libdb5.3 libffi6 (>= 3.0.4) libmpdec2 libncursesw6 (>= 6) libtinfo6 (>= 6) libreadline7 (>= 7.0~beta) libsqlite3-0 (>= 3.7.15) libuuid1 (>= 2.20.1) bzip2file xz-utils (= 1.0.6-9) libmagic1 (= 1:5.35-4) libmagic-mgc (= 1:5.35-4) (>= 5.2.2)xz-lzma (= 6.1+20181013-2) libgpm2 (>= 6) readline-common (>= 1.15.4) libreadline-common (>= 1.16.1) uuid-runtime (>= 2.25-5~) (>= 2.31.1) adduserlibsmartcols1 (>= 2.27~rc1) libsystemd0 (>= 0.5) passwd (>= 5.1.1alpha+20120614) libgcrypt20 (>= 1.8.0) liblz4-1 (>= 0.0~r122) libgpg-error0 (>= 1.25) libgpg-error-l10n (= 3.7.3-2) (= 3.7.3-2) (>= 3.7.3-1~) [python3.7] [python3.7] libgfortran5 (>= 8) libquadmath0 (>= 4.6) ... -6gcc-9-base (= 9-20190428-1) (>= 4.6) (= 9-20190428-1) (>= 8) (>= 4.6) ... -3- (>= 3.3.2-2~) (<< 3.8)(>= 3.6~) (>= 1.6.2-1) (<< 3.8) (>= 3.7~) (>= 2.2.1) [mime-support] python3-pil.imagetk libimagequant0 (>= 2.11.10) libjpeg62-turbo (>= 1.3.1) liblcms2-2 (>= 2.2+git20110628) libtiff5 (>= 4.0.3) libwebp6 (>= 0.5.1) libwebpdemux2 (>= 0.5.1) libwebpmux3 (>= 0.6.1-2) python3-olefile (<< 3.8)(>= 3.7~) (= 6.0.0-1) (>= 3.4.1-2) (>= 3.7.1-1~)(<< 3.9) blt (>= 2.4z-9) tk8.6-blt2.5 (>= 2.5.3) libtcl8.6 (>= 8.6.0) libtk8.6 (>= 8.6.0)(= 2.5.3+dfsg-5) (>= 8.6.0) (>= 8.6.0) blt4.2blt8.0 blt8.0-unoff (>= 2.2.1) (>= 8.6.0-2) libfontconfig1 (>= 2.12.6) libxext6 libxft2 (>> 2.1.1) libxss1 (>= 2.3.5)(>= 2.12.6) libxrender1 x11-common libjpeg62 (>= 5.1.1alpha+20120614) (>= 1.3.1) libjbig0 (>= 2.0) (>= 0.5.1) libzstd1 (>= 1.3.2) (>= 0.5.1)(>= 0.5.1) Matplotlib library Python dependencies Real dependencies Fake OS dependencies induced by package granularity The human side design, algorithm, code, test, documentation, community, funding and so many more facets ... Jaime Arias [email protected] (CC-BY 4.0) A Hands-On Introduction to Software Heritage November 4, 2025 5 / 1 Source code is special (software is not data) Software evolves over time projects may last decades the development history is key to its understanding Complexity millions of lines of code large web of dependencies easy to break, difficult to maintain research software a thin top layer sophisticated developer communities python3-matplotlib python3-dateutil python3-six (>= 1.4) python3:any python-matplotlib-data (>= 3.0.2-2) python3-pyparsing (>= 1.5.6) libjs-jquery libjs-jquery-ui python3-numpy (>= 1:1.14.3) python3 (<< 3.8) (>= 3.7~) python3-numpy-abi9 python3-cycler (>= 0.10.0) python3-kiwisolver libfreetype6 (>= 2.2.1) libpng16-16 (>= 1.6.2-1) python3-pil python3-tk (>= 1.5) (>= 3.2~) tzdata [python3] [python3] {debconf} debconf-2.0 (>= 0.5) [debconf] {cdebconf} fonts-lyx ttf-bitstream-vera (>= 3.3.2-2~) jquery javascript-common (>= 1.7) (<< 3.8)(>= 3.7~)python3.7:any libblas3 libblas.so.3 liblapack3 liblapack.so.3python3-pkg-resources python3-minimal (= 3.7.3-1) python3.7 (>= 3.7.3-1~) libpython3-stdlib (= 3.7.3-1) python3.7-minimal (>= 3.7.3-1~) {dpkg} install-info (>= 1.13.20) libpython3.7-minimal (= 3.7.3-2) libexpat1 (>= 2.1~beta3) libssl1.1 (>= 1.1.1) libpython3.7-stdlib (>= 0.5) (= 3.7.3-2) mime-support libbz2-1.0 liblzma5 (>= 5.1.1alpha+20120614) libdb5.3 libffi6 (>= 3.0.4) libmpdec2 libncursesw6 (>= 6) libtinfo6 (>= 6) libreadline7 (>= 7.0~beta) libsqlite3-0 (>= 3.7.15) libuuid1 (>= 2.20.1) bzip2file xz-utils (= 1.0.6-9) libmagic1 (= 1:5.35-4) libmagic-mgc (= 1:5.35-4) (>= 5.2.2)xz-lzma (= 6.1+20181013-2) libgpm2 (>= 6) readline-common (>= 1.15.4) libreadline-common (>= 1.16.1) uuid-runtime (>= 2.25-5~) (>= 2.31.1) adduserlibsmartcols1 (>= 2.27~rc1) libsystemd0 (>= 0.5) passwd (>= 5.1.1alpha+20120614) libgcrypt20 (>= 1.8.0) liblz4-1 (>= 0.0~r122) libgpg-error0 (>= 1.25) libgpg-error-l10n (= 3.7.3-2) (= 3.7.3-2) (>= 3.7.3-1~) [python3.7] [python3.7] libgfortran5 (>= 8) libquadmath0 (>= 4.6) ... -6gcc-9-base (= 9-20190428-1) (>= 4.6) (= 9-20190428-1) (>= 8) (>= 4.6) ... -3- (>= 3.3.2-2~) (<< 3.8)(>= 3.6~) (>= 1.6.2-1) (<< 3.8) (>= 3.7~) (>= 2.2.1) [mime-support] python3-pil.imagetk libimagequant0 (>= 2.11.10) libjpeg62-turbo (>= 1.3.1) liblcms2-2 (>= 2.2+git20110628) libtiff5 (>= 4.0.3) libwebp6 (>= 0.5.1) libwebpdemux2 (>= 0.5.1) libwebpmux3 (>= 0.6.1-2) python3-olefile (<< 3.8)(>= 3.7~) (= 6.0.0-1) (>= 3.4.1-2) (>= 3.7.1-1~)(<< 3.9) blt (>= 2.4z-9) tk8.6-blt2.5 (>= 2.5.3) libtcl8.6 (>= 8.6.0) libtk8.6 (>= 8.6.0)(= 2.5.3+dfsg-5) (>= 8.6.0) (>= 8.6.0) blt4.2blt8.0 blt8.0-unoff (>= 2.2.1) (>= 8.6.0-2) libfontconfig1 (>= 2.12.6) libxext6 libxft2 (>> 2.1.1) libxss1 (>= 2.3.5)(>= 2.12.6) libxrender1 x11-common libjpeg62 (>= 5.1.1alpha+20120614) (>= 1.3.1) libjbig0 (>= 2.0) (>= 0.5.1) libzstd1 (>= 1.3.2) (>= 0.5.1)(>= 0.5.1) Matplotlib library Python dependencies Real dependencies Fake OS dependencies induced by package granularity The human side design, algorithm, code, test, documentation, community, funding and so many more facets ... Jaime Arias [email protected] (CC-BY 4.0) A Hands-On Introduction to Software Heritage November 4, 2025 5 / 1 Software Heritage in a nutshell www.softwareheritage.org THE GREAT LIBRA RY OF SO URCE CO D E Collect, preserve and share all software source code Preserving our heritage, enabling better software and better science for all Reference catalog find and reference all software source code Universal archive preserve and share all software source code Research infrastructure enable analysis of all software source code Jaime Arias [email protected] (CC-BY 4.0) A Hands-On Introduction to Software Heritage November 4, 2025 7 / 1 Software Heritage in a nutshell www.softwareheritage.org THE GREAT LIBRA RY OF SO URCE CO D E Collect, preserve and share all software source code Preserving our heritage, enabling better software and better science for all Reference catalog find and reference all software source code Universal archive preserve and share all software source code Research infrastructure enable analysis of all software source code Jaime Arias [email protected] (CC-BY 4.0) A Hands-On Introduction to Software Heritage November 4, 2025 7 / 1 Software Heritage in a nutshell www.softwareheritage.org THE GREAT LIBRA RY OF SO URCE CO D E Collect, preserve and share all software source code Preserving our heritage, enabling better software and better science for all Reference catalog find and reference all software source code Universal archive preserve and share all software source code Research infrastructure enable analysis of all software source code Jaime Arias [email protected] (CC-BY 4.0) A Hands-On Introduction to Software Heritage November 4, 2025 7 / 1 Software Heritage: a radically different approach to archiving dsc dsc hg hg hg git git git git svn svn svn tar zip software origins Package repos Forges GitHub lister GitLab lister Debian lister PyPi lister . . . Distros ... Listing (full/incremental) tar Jaime Arias [email protected] (CC-BY 4.0) A Hands-On Introduction to Software Heritage November 4, 2025 8 / 1 Software Heritage: a radically different approach to archiving Git loader Mercurial loader Debian source package loader pypi source package loader . . . Software Heritage Archive Merkle DAG + blob storage Loading & deduplication dsc dsc hg hg hg git git git git svn svn svn tar zip software origins Package repos Forges GitHub lister GitLab lister Debian lister PyPi lister . . . Distros ... Scheduling Listing (full/incremental) tar origins snapshots releases revisionsrevisions directoriesdirectories contents Jaime Arias [email protected] (CC-BY 4.0) A Hands-On Introduction to Software Heritage November 4, 2025 8 / 1 Meet the SWHID identifier SWHIDs (SoftWare Hash IDentifiers) are persistent, intrinsic identifiers for software source code artifacts. SWHID has been officially adopted as ISO/IEC 18670:2025 on April 23, 2025. Jaime Arias [email protected] (CC-BY 4.0) A Hands-On Introduction to Software Heritage November 4, 2025 9 / 1 Meet the SWHID identifier SWHIDs (SoftWare Hash IDentifiers) are persistent, intrinsic identifiers for software source code artifacts. SWHID has been officially adopted as ISO/IEC 18670:2025 on April 23, 2025. Jaime Arias [email protected] (CC-BY 4.0) A Hands-On Introduction to Software Heritage November 4, 2025 9 / 1 Meet the SWHID identifier SWHIDs (SoftWare Hash IDentifiers) are persistent, intrinsic identifiers for software source code artifacts. SWHID has been officially adopted as ISO/IEC 18670:2025 on April 23, 2025. Jaime Arias [email protected] (CC-BY 4.0) A Hands-On Introduction to Software Heritage November 4, 2025 9 / 1 Outline Jaime Arias [email protected] (CC-BY 4.0) A Hands-On Introduction to Software Heritage November 4, 2025 10 / 1 Software Heritage 1Prepare your public repository README, AUTHORS & LICENSE files 2Save your code http://save.softwareheritage.org/ 3Reference your work (full repository, specific version or code fragment) Jaime Arias [email protected] (CC-BY 4.0) A Hands-On Introduction to Software Heritage November 4, 2025 10 / 1 3. Reference: the biblatex-software Package biblatex-software is integrated into CTAN and TeXLive, and it works out-of-the-box in Overleaf As of April 2022, it is integrated in the ACM article style Four dedicated entry types that reflect different levels of granularity: @software — for general references to computer software @softwaremodule — for citing a specific module within a larger software project @softwareversion — for referencing a particular version of a software @codefragment — for pinpointing a specific code fragment, such as an algorithm or a key function within a program or library https: //ctan.org/pkg/ biblatex-software Jaime Arias [email protected] (CC-BY 4.0) A Hands-On Introduction to Software Heritage November 4, 2025 17 / 1 3. Reference: the biblatex-software Package biblatex-software is integrated into CTAN and TeXLive, and it works out-of-the-box in Overleaf As of April 2022, it is integrated in the ACM article style Four dedicated entry types that reflect different levels of granularity: @software — for general references to computer software @softwaremodule — for citing a specific module within a larger software project @softwareversion — for referencing a particular version of a software @codefragment — for pinpointing a specific code fragment, such as an algorithm or a key function within a program or library https: //ctan.org/pkg/ biblatex-software Jaime Arias [email protected] (CC-BY 4.0) A Hands-On Introduction to Software Heritage November 4, 2025 17 / 1 3. Reference: the biblatex-software Package biblatex-software is integrated into CTAN and TeXLive, and it works out-of-the-box in Overleaf As of April 2022, it is integrated in the ACM article style Four dedicated entry types that reflect different levels of granularity: @software — for general references to computer software @softwaremodule — for citing a specific module within a larger software project @softwareversion — for referencing a particular version of a software @codefragment — for pinpointing a specific code fragment, such as an algorithm or a key function within a program or library https: //ctan.org/pkg/ biblatex-software Jaime Arias [email protected] (CC-BY 4.0) A Hands-On Introduction to Software Heritage November 4, 2025 17 / 1 3. Reference: the biblatex-software Package biblatex-software is integrated into CTAN and TeXLive, and it works out-of-the-box in Overleaf As of April 2022, it is integrated in the ACM article style Four dedicated entry types that reflect different levels of granularity: @software — for general references to computer software @softwaremodule — for citing a specific module within a larger software project @softwareversion — for referencing a particular version of a software @codefragment — for pinpointing a specific code fragment, such as an algorithm or a key function within a program or library https: //ctan.org/pkg/ biblatex-software Jaime Arias [email protected] (CC-BY 4.0) A Hands-On Introduction to Software Heritage November 4, 2025 17 / 1 3. Reference: the biblatex-software Package biblatex-software is integrated into CTAN and TeXLive, and it works out-of-the-box in Overleaf As of April 2022, it is integrated in the ACM article style Four dedicated entry types that reflect different levels of granularity: @software — for general references to computer software @softwaremodule — for citing a specific module within a larger software project @softwareversion — for referencing a particular version of a software @codefragment — for pinpointing a specific code fragment, such as an algorithm or a key function within a program or library https: //ctan.org/pkg/ biblatex-software Jaime Arias [email protected] (CC-BY 4.0) A Hands-On Introduction to Software Heritage November 4, 2025 17 / 1 3. Reference: the biblatex-software Package biblatex-software is integrated into CTAN and TeXLive, and it works out-of-the-box in Overleaf As of April 2022, it is integrated in the ACM article style Four dedicated entry types that reflect different levels of granularity: @software — for general references to computer software @softwaremodule — for citing a specific module within a larger software project @softwareversion — for referencing a particular version of a software @codefragment — for pinpointing a specific code fragment, such as an algorithm or a key function within a program or library https: //ctan.org/pkg/ biblatex-software Jaime Arias [email protected] (CC-BY 4.0) A Hands-On Introduction to Software Heritage November 4, 2025 17 / 1 3. Reference: the biblatex-software Package biblatex-software is integrated into CTAN and TeXLive, and it works out-of-the-box in Overleaf As of April 2022, it is integrated in the ACM article style Four dedicated entry types that reflect different levels of granularity: @software — for general references to computer software @softwaremodule — for citing a specific module within a larger software project @softwareversion — for referencing a particular version of a software @codefragment — for pinpointing a specific code fragment, such as an algorithm or a key function within a program or library https: //ctan.org/pkg/ biblatex-software Jaime Arias [email protected] (CC-BY 4.0) A Hands-On Introduction to Software Heritage November 4, 2025 17 / 1 3. Reference: the biblatex-software Package https: //ctan.org/pkg/ biblatex-software Jaime Arias [email protected] (CC-BY 4.0) A Hands-On Introduction to Software Heritage November 4, 2025 18 / 1 3. Reference: the biblatex-software Package 1@software{parmap, 2title = {The Parmap library}, 3author = {Di Cosmo, Roberto and Marco Danelutto}, 4date = {2012}, 5institution = {{Inria} and {University of Paris} and {University of Pisa}}, 6license = {LGPL-2.0}, 7url = {https://rdicosmo.github.io/parmap/}, 8repository= {https://github.com/rdicosmo/parmap}, 9} 10 11 @softwareversion{parmap-1.1.1, 12 crossref = {parmap}, 13 date = {2020}, 14 version = {1.1.1}, 15 swhid = {swh:1:rel:373e2604d96de4ab1d505190b654c5c4045db773; 16 origin=https://github.com/rdicosmo/parmap; 17 visit=swh:1:snp:2a6c348c53eb77d458f24c9cbcecaf92e3c45615}, 18 } 19 20 @codefragment{simplemapper, 21 subtitle = {Core mapping routine}, 22 swhid = {swh:1:cnt:43a6b232768017b03da934ba22d9cc3f2726a6c5; 23 origin=https://github.com/rdicosmo/parmap; 24 visit=swh:1:snp:2a6c348c53eb77d458f24c9cbcecaf92e3c45615; 25 anchor=swh:1:rel:373e2604d96de4ab1d505190b654c5c4045db773; 26 path=/src/parmap.ml; 27 lines=192-228}, 28 crossref = {parmap-1.1.1} 29 } https: //bit.ly/3JKXJbT Jaime Arias [email protected] (CC-BY 4.0) A Hands-On Introduction to Software Heritage November 4, 2025 19 / 1 3. Reference: Describing Software Projects with CodeMeta https://codemeta. github.io/ codemeta-generator/ Jaime Arias [email protected] (CC-BY 4.0) A Hands-On Introduction to Software Heritage November 4, 2025 20 / 1