(IUCr) Crystallographic Information Framework

<!DOCTYPE html>   <html> <head> <script src="https://journals.iucr.org/javascript/analytics.js"></script> <title>(IUCr) Crystallographic Information Framework</title> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no"> <meta name="DC.title" content="Crystallographic Information Framework"> <link href="https://www.iucr.org/__data/assets/css_file/0020/129404/fontawesome-4.4.0.min.css?v=0.1.10" rel="stylesheet" type="text/css" media="all"> <link href="https://www.iucr.org/__data/assets/css_file/0006/129399/college-font.css?v=0.1.4" rel="stylesheet" type="text/css" media="all"> <link href="https://www.iucr.org/__data/assets/css_file/0018/129402/framework.css?v=0.1.4" rel="stylesheet" type="text/css" media="all"> <link href="https://www.iucr.org/__data/assets/css_file/0008/129392/layout.css?v=0.1.22" rel="stylesheet" type="text/css" media="all"> <link 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<li> <a class="drop" href="https://www.iucr.org/iucr/governance">governance</a> <ul> <li> <a href="https://www.iucr.org/iucr/governance/ga">general assembly</a> </li> <li> <a href="https://www.iucr.org/iucr/governance/ec">executive committee</a> </li> <li> <a href="https://www.iucr.org/iucr/governance/finance.html">finance committee</a> </li> <li> <a href="https://www.iucr.org/iucr/governance/advisory-committees">advisory committees</a> </li> <li> <a href="https://www.iucr.org/iucr/governance/secretariat">secretariat</a> </li> <li> <a href="https://www.iucr.org/iucr/governance/statutes-and-by-laws">statutes and by-laws</a> </li> <li> <a href="https://www.iucr.org/iucr/governance/mediaenquiries">Media Enquiries</a> </li> </ul> </li> <li> <a class="drop" href="https://www.iucr.org/iucr/ab.html">membership</a> <ul> <li> <a href="https://www.iucr.org/iucr/ab.html/adhering-bodies">adhering bodies</a> </li> <li> <a href="https://www.iucr.org/iucr/ab.html/regional-associates">regional 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href="https://www.iucr.org/iucr/commissions/teaching">crystallographic teaching</a> </li> <li> <a href="https://www.iucr.org/iucr/commissions/art-and-cultural-heritage">crystallography in art and cultural heritage</a> </li> <li> <a href="https://www.iucr.org/iucr/commissions/crystallography-of-materials">crystallography of materials</a> </li> <li> <a href="https://www.iucr.org/iucr/commissions/diffraction-microstructure-imaging">diffraction microstructure imaging</a> </li> <li> <a href="https://www.iucr.org/iucr/commissions/electron-crystallography">electron crystallography</a> </li> <li> <a href="https://www.iucr.org/iucr/commissions/high-pressure">high pressure</a> </li> <li> <a href="https://www.iucr.org/iucr/commissions/inorganic-and-mineral-structures">inorganic and mineral structures</a> </li> <li> <a href="https://www.iucr.org/iucr/commissions/international-tables">international tables</a> </li> <li> <a href="https://www.iucr.org/iucr/commissions/journals">journals</a> </li> 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href="https://www.iucr.org/iucr/cong/iucr-xxiii">2014 iucr xxiii</a> </li> <li> <a href="https://www.iucr.org/iucr/cong/iucr-xxii">2011 iucr xxii</a> </li> <li> <a href="https://www.iucr.org/iucr/cong/iucr-xxi">2008 iucr xxi</a> </li> <li> <a href="https://www.iucr.org/iucr/cong/iucr-xx">2005 iucr xx</a> </li> <li> <a href="https://www.iucr.org/iucr/cong/iucr-xix">2002 iucr xix</a> </li> <li> <a href="https://www.iucr.org/iucr/cong/iucr-xviii">1999 iucr xviii</a> </li> <li> <a href="https://www.iucr.org/iucr/cong/iucr-xvii">1996 iucr xvii</a> </li> <li> <a href="https://www.iucr.org/iucr/cong/iucr-xvi">1993 iucr xvi</a> </li> <li> <a href="https://www.iucr.org/iucr/cong/iucr-xv">1990 iucr xv</a> </li> <li> <a href="https://www.iucr.org/iucr/cong/iucr-xiv">1987 iucr xiv</a> </li> <li> <a href="https://www.iucr.org/iucr/cong/iucr-xiii">1984 iucr xiii</a> </li> <li> <a href="https://www.iucr.org/iucr/cong/iucr-xii">1981 iucr xii</a> </li> <li> <a href="https://www.iucr.org/iucr/cong/iucr-xi">1978 iucr xi</a> </li> <li> <a href="https://www.iucr.org/iucr/cong/iucr-x">1975 iucr x</a> </li> <li> <a href="https://www.iucr.org/iucr/cong/iucr-ix">1972 iucr ix</a> </li> <li> <a href="https://www.iucr.org/iucr/cong/iucr-viii">1969 iucr viii</a> </li> <li> <a href="https://www.iucr.org/iucr/cong/iucr-vii">1966 iucr vii</a> </li> <li> <a href="https://www.iucr.org/iucr/cong/iucr-vi">1963 iucr vi</a> </li> <li> <a href="https://www.iucr.org/iucr/cong/iucr-v">1960 iucr v</a> </li> <li> <a href="https://www.iucr.org/iucr/cong/iucr-iv">1957 iucr iv</a> </li> <li> <a href="https://www.iucr.org/iucr/cong/iucr-iii">1954 iucr iii</a> </li> <li> <a href="https://www.iucr.org/iucr/cong/iucr-ii">1951 iucr ii</a> </li> <li> <a href="https://www.iucr.org/iucr/cong/iucr-i">1948 iucr i</a> </li> </ul> </li> <li> <a class="drop" href="https://www.iucr.org/iucr/history">history</a> <ul> <li> <a href="https://www.iucr.org/iucr/history/aspects">aspects</a> </li> <li> <a href="https://www.iucr.org/iucr/history/early-history">early history</a> </li> <li> <a href="https://www.iucr.org/iucr/history/journals-history">journals history</a> </li> <li> <a href="https://www.iucr.org/iucr/history/previous">previous executive committees</a> </li> <li> <a href="https://www.iucr.org/iucr/history/photos">photos of crystallographers</a> </li> <li> <a href="https://www.iucr.org/iucr/history/xray-diffraction">50 years of x-ray diffraction</a> </li> </ul> </li> </ul> </li> <li><a class="drop" href="https://www.iucr.org/news">news</a> <ul> <li> <a class="drop" href="https://www.iucr.org/news/whats-new">what's new</a> <ul> <li> <a href="https://www.iucr.org/news/whats-new/whats-new-by-date">what's new by date</a> </li> <li> <a href="https://www.iucr.org/news/whats-new/announcements2">announcements</a> </li> <li> <a href="https://www.iucr.org/news/whats-new/employment">jobs</a> </li> <li> <a href="https://www.iucr.org/news/whats-new/journal-issues">journal 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<li> <a href="https://www.iucr.org/outreach/openlabs/bruker-openlab-vietnam">Bruker OpenLab Vietnam</a> </li> <li> <a href="https://www.iucr.org/outreach/openlabs/agilent-openlab-hong-kong">Agilent OpenLab Hong Kong</a> </li> <li> <a href="https://www.iucr.org/outreach/openlabs/panalytical-openlab-mexico">PANalytical OpenLab Mexico</a> </li> <li> <a href="https://www.iucr.org/outreach/openlabs/grenoble-darmstadt">grenoble-darmstadt</a> </li> <li> <a href="https://www.iucr.org/outreach/openlabs/agilent-openlab-turkey">Agilent OpenLab Turkey</a> </li> <li> <a href="https://www.iucr.org/outreach/openlabs/bruker-openlab-uruguay">Bruker OpenLab Uruguay</a> </li> <li> <a href="https://www.iucr.org/outreach/openlabs/rigaku-openlab-cambodia">Rigaku OpenLab Cambodia</a> </li> <li> <a href="https://www.iucr.org/outreach/openlabs/panalytical-openlab-ghana">PANalytical OpenLab Ghana</a> </li> <li> <a href="https://www.iucr.org/outreach/openlabs/bruker-openlab-morocco">Bruker OpenLab Morocco</a> </li> <li> <a href="https://www.iucr.org/outreach/openlabs/agilent-openlab-argentina">Agilent OpenLab Argentina</a> </li> <li> <a href="https://www.iucr.org/outreach/openlabs/bruker-openlab-pakistan">Bruker OpenLab Pakistan</a> </li> </ul> </li> <li> <a class="drop" href="https://www.iucr.org/outreach/africa">initiative in africa</a> </li> <li> <a class="drop" href="https://www.iucr.org/outreach/success-story">success stories</a> <ul> <li> <a href="https://www.iucr.org/outreach/success-story/icsu2015">IUCr-ICSU 2015</a> </li> <li> <a href="https://www.iucr.org/outreach/success-story/afca">AfCA</a> </li> <li> <a href="https://www.iucr.org/outreach/success-story/iycr">iycr2014</a> </li> </ul> </li> <li> <a class="drop" href="https://www.iucr.org/outreach/laamp">LAAAMP</a> </li> <li> <a class="drop" href="https://www.iucr.org/outreach/sponsorship">support</a> <ul> <li> <a href="https://www.iucr.org/outreach/sponsorship/vp.html">visiting professorships</a> </li> <li> <a href="https://www.iucr.org/outreach/sponsorship/meetings.html">meetings</a> </li> <li> <a href="https://www.iucr.org/outreach/sponsorship/iucr-outreach-fund">outreach and education</a> </li> </ul> </li> </ul> </li> </ul> </nav>  </header> </div>     <style type="text/css"> div#pageintro { padding-top: 64px; padding-bottom: 64px; } div#pageintro article { max-width:80%; } </style> <div id="content_div_129411"> <div class="wrapper bgded overlay" style="background-image:url(/cgi-bin/getiucrphoto.php?ms=data&no=6);"> <div id="pageintro" class="hoc clear">  <article> <h2 class="heading underline center">Crystallographic Information Framework</h2> <p>The International Union of Crystallography is the sponsor of the Crystallographic Information Framework, a standard for information interchange in crystallography.</p> <footer> <a class="btn" href="https://www.iucr.org/resources/cif/dictionaries">CIF dictionaries</a><a class="btn" href="https://www.iucr.org/resources/cif/software">Software</a> </footer> </article> </div> </div> </div>               <div class="wrapper row3"> <header id="minisite" class="hoc"> <nav id="mainav2" class="fl_right"> <ul class="clear"> <li><a class="drop" href="https://www.iucr.org/resources/cif/spec">specification</a> <ul> <li> <a class="drop" href="https://www.iucr.org/resources/cif/spec/cif-2-development">cif2</a> </li> <li> <a class="drop" href="https://www.iucr.org/resources/cif/spec/version1.1">version1.1</a> <ul> <li> <a href="https://www.iucr.org/resources/cif/spec/version1.1/cifsyntax">syntax</a> </li> <li> <a href="https://www.iucr.org/resources/cif/spec/version1.1/semantics">semantics</a> </li> </ul> </li> <li> <a class="drop" href="https://www.iucr.org/resources/cif/spec/ancillary">ancillary</a> <ul> <li> <a href="https://www.iucr.org/resources/cif/spec/ancillary/placeholders">placeholders</a> </li> <li> <a href="https://www.iucr.org/resources/cif/spec/ancillary/datetime">date/time</a> </li> <li> <a href="https://www.iucr.org/resources/cif/spec/ancillary/phonefax">phone/fax</a> </li> <li> <a href="https://www.iucr.org/resources/cif/spec/ancillary/names">names</a> </li> <li> <a href="https://www.iucr.org/resources/cif/spec/ancillary/abbreviations">abbreviations</a> </li> <li> <a href="https://www.iucr.org/resources/cif/spec/ancillary/reserved-prefixes">reserved prefixes</a> </li> </ul> </li> <li> <a class="drop" href="https://www.iucr.org/resources/cif/spec/star-file">star file</a> </li> <li> <a class="drop" href="https://www.iucr.org/resources/cif/spec/ddl">ddl</a> </li> </ul> </li> <li><a class="drop" href="https://www.iucr.org/resources/cif/documentation">documentation</a> <ul> <li> <a class="drop" href="https://www.iucr.org/resources/cif/documentation/cifguide">authors' guide to cif</a> </li> </ul> </li> <li><a class="drop" href="https://www.iucr.org/resources/cif/software">software</a> <ul> <li> <a class="drop" href="https://www.iucr.org/resources/cif/software/index">index</a> </li> <li> <a class="drop" href="https://www.iucr.org/resources/cif/software/tc">terms and conditions</a> </li> <li> <a class="drop" href="https://www.iucr.org/resources/cif/software/gpl">gnu general public license</a> </li> <li> <a class="drop" href="https://www.iucr.org/resources/cif/software/cbflib">cbflib</a> </li> <li> <a class="drop" href="https://www.iucr.org/resources/cif/software/cif2cif">cif2cif</a> </li> <li> <a class="drop" href="https://www.iucr.org/resources/cif/software/cif2pdb">cif2pdb</a> </li> <li> <a class="drop" href="https://www.iucr.org/resources/cif/software/cif2sx">cif2sx</a> </li> <li> <a class="drop" href="https://www.iucr.org/resources/cif/software/cif2xml">cif2xml</a> </li> <li> <a class="drop" href="https://www.iucr.org/resources/cif/software/cifedit">cifedit</a> </li> <li> <a class="drop" href="https://www.iucr.org/resources/cif/software/ciffold">ciffold</a> </li> <li> <a class="drop" href="https://www.iucr.org/resources/cif/software/cifio">cifio</a> </li> <li> <a class="drop" href="https://www.iucr.org/resources/cif/software/ciflib">ciflib</a> <ul> <li> <a href="https://www.iucr.org/__data/assets/text_file/0005/17807/pdblicence.txt">pdblicence.txt</a> </li> </ul> </li> <li> <a class="drop" href="https://www.iucr.org/resources/cif/software/cifparse">cifparse</a> <ul> <li> <a href="https://www.iucr.org/__data/assets/text_file/0006/17898/pdblicence.txt">pdblicence.txt</a> </li> </ul> </li> <li> <a class="drop" href="https://www.iucr.org/resources/cif/software/cifparse-obj">cifparse-obj</a> <ul> <li> <a href="https://www.iucr.org/__data/assets/text_file/0003/17904/installation.txt">installationnotes.txt</a> </li> <li> <a href="https://www.iucr.org/__data/assets/text_file/0020/17903/pdblicence.txt">pdblicence.txt</a> </li> <li> <a href="https://www.iucr.org/resources/cif/software/cifparse-obj/usage">usage</a> </li> </ul> </li> <li> <a class="drop" href="https://www.iucr.org/resources/cif/software/cifsieve">cifsieve</a> </li> <li> <a class="drop" href="https://www.iucr.org/resources/cif/software/ciftbx4">ciftbx4</a> </li> <li> <a class="drop" href="https://www.iucr.org/resources/cif/software/ciftex">ciftex</a> </li> <li> <a class="drop" href="https://www.iucr.org/resources/cif/software/ciftools">ciftools</a> </li> <li> <a class="drop" href="https://www.iucr.org/resources/cif/software/cyclops2">cyclops2</a> </li> <li> <a class="drop" href="https://www.iucr.org/resources/cif/software/dbloader">dbloader</a> <ul> <li> <a href="https://www.iucr.org/__data/assets/text_file/0011/18011/installation.txt">installationnotes.txt</a> </li> <li> <a href="https://www.iucr.org/__data/assets/text_file/0012/18012/pdblicence.txt">pdblicence.txt</a> </li> <li> <a href="https://www.iucr.org/resources/cif/software/dbloader/usage">usage</a> </li> </ul> </li> <li> <a class="drop" href="https://www.iucr.org/resources/cif/software/dict-obj-file">dict-obj-file</a> <ul> <li> <a href="https://www.iucr.org/__data/assets/text_file/0005/17888/installationnotes.txt">installationnotes.txt</a> </li> <li> <a href="https://www.iucr.org/__data/assets/text_file/0006/17889/pdblicence.txt">pdblicence.txt</a> </li> <li> <a href="https://www.iucr.org/resources/cif/software/dict-obj-file/usage">usage</a> </li> </ul> </li> <li> <a class="drop" href="https://www.iucr.org/resources/cif/software/difrac">difrac</a> <ul> <li> <a href="https://www.iucr.org/__data/assets/text_file/0008/17918/README.1ST">README.1ST</a> </li> </ul> </li> <li> <a class="drop" href="https://www.iucr.org/resources/cif/software/istable">istable</a> <ul> <li> <a href="https://www.iucr.org/__data/assets/text_file/0005/17951/installation.txt">installationnotes.txt</a> </li> <li> <a href="https://www.iucr.org/__data/assets/text_file/0006/17952/pdblicence.txt">pdblicence.txt</a> </li> <li> <a href="https://www.iucr.org/resources/cif/software/istable/usage">usage</a> </li> </ul> </li> <li> <a class="drop" href="https://www.iucr.org/resources/cif/software/pymmlib">mmlib</a> </li> <li> <a class="drop" href="https://www.iucr.org/resources/cif/software/openmms">openmms</a> <ul> <li> <a href="https://www.iucr.org/__data/assets/file/0012/18030/COPYRIGHT.html">ucsdcopyright.html</a> </li> </ul> </li> <li> <a class="drop" href="https://www.iucr.org/resources/cif/software/pdb2cif">pdb2cif</a> </li> <li> <a class="drop" href="https://www.iucr.org/resources/cif/software/pdbextract">pdbextract</a> <ul> <li> <a href="https://www.iucr.org/__data/assets/text_file/0013/18004/pdblicence.txt">pdblicence.txt</a> </li> <li> <a href="https://www.iucr.org/__data/assets/file/0014/18005/install_src.html">install source</a> </li> <li> <a href="https://www.iucr.org/__data/assets/file/0015/18006/install_bin.html">install bin</a> </li> </ul> </li> <li> <a class="drop" href="https://www.iucr.org/resources/cif/software/pdcifplot">pdcifplot</a> </li> <li> <a class="drop" href="https://www.iucr.org/resources/cif/software/prepub">prepub</a> </li> <li> <a class="drop" href="https://www.iucr.org/resources/cif/software/publcif">publcif</a> </li> <li> <a class="drop" href="https://www.iucr.org/resources/cif/software/pycifrw">pycifrw</a> <ul> <li> <a href="https://www.iucr.org/resources/cif/software/pycifrw/overview">overview</a> </li> </ul> </li> <li> <a class="drop" href="https://www.iucr.org/resources/cif/software/quasar">quasar</a> <ul> <li> <a href="https://www.iucr.org/__data/assets/text_file/0015/11904/quasar.txt">quasar.txt</a> </li> <li> <a href="https://www.iucr.org/resources/cif/software/quasar/quasar">quasar</a> </li> <li> <a href="https://www.iucr.org/resources/cif/software/quasar/doc">doc</a> </li> </ul> </li> <li> <a class="drop" href="https://www.iucr.org/resources/cif/software/rasmol">rasmol</a> </li> <li> <a class="drop" href="https://www.iucr.org/resources/cif/software/starbase">starbase</a> <ul> <li> <a href="https://www.iucr.org/__data/assets/file/0012/11343/sb_tar.Z">sb_tar.Z</a> </li> <li> <a href="https://www.iucr.org/resources/cif/software/starbase/sb">sb</a> </li> <li> <a href="https://www.iucr.org/resources/cif/software/starbase/doc">doc</a> </li> </ul> </li> <li> <a class="drop" href="https://www.iucr.org/resources/cif/software/starparser">starparser</a> <ul> <li> <a href="https://www.iucr.org/__data/assets/text_file/0003/17913/ucsdcopyright.txt">ucsdcopyright.txt</a> </li> </ul> </li> <li> <a class="drop" href="https://www.iucr.org/resources/cif/software/trip">trip</a> </li> <li> <a class="drop" href="https://www.iucr.org/resources/cif/software/vcif2">vcif2</a> <ul> <li> <a href="https://www.iucr.org/__data/assets/file/0017/11519/CBFlib_0.7.8_28Jul07.tar.gz">CBFlib_0.7.8.tar.gz</a> </li> <li> <a href="https://www.iucr.org/__data/assets/file/0009/11520/vcifHTML.tar.gz">vcifHTML.tar.gz</a> </li> </ul> </li> <li> <a class="drop" href="https://www.iucr.org/resources/cif/software/xtal">xtal</a> <ul> <li> <a href="https://www.iucr.org/resources/cif/software/xtal/release-notes">release notes</a> </li> </ul> </li> <li> <a class="drop" href="https://www.iucr.org/resources/cif/software/archived">archived</a> <ul> <li> <a href="https://www.iucr.org/resources/cif/software/archived/index">index</a> </li> <li> <a href="https://www.iucr.org/resources/cif/software/archived/cifobj">cifobj</a> </li> <li> <a href="https://www.iucr.org/resources/cif/software/archived/ciftbx">ciftbx 1</a> </li> <li> <a href="https://www.iucr.org/resources/cif/software/archived/ciftbx3">ciftbx3</a> </li> <li> <a href="https://www.iucr.org/resources/cif/software/archived/cyclops">cyclops 1</a> </li> <li> <a href="https://www.iucr.org/resources/cif/software/archived/makedict">makedict</a> </li> <li> <a href="https://www.iucr.org/resources/cif/software/archived/oostar">oostar</a> </li> <li> <a href="https://www.iucr.org/resources/cif/software/archived/printcifword">printcifword</a> </li> <li> <a href="https://www.iucr.org/resources/cif/software/archived/ciftest1">ciftest1</a> </li> <li> <a href="https://www.iucr.org/resources/cif/software/archived/vcif-0.58">vcif 0.58</a> </li> <li> <a href="https://www.iucr.org/resources/cif/software/archived/vcif-1.2">vcif 1.2</a> </li> <li> <a href="https://www.iucr.org/resources/cif/software/archived/zinc">zinc</a> </li> </ul> </li> </ul> </li> <li><a class="drop" href="https://www.iucr.org/resources/cif/comcifs">comcifs</a> <ul> <li> <a class="drop" href="https://www.iucr.org/resources/cif/comcifs/terms-of-reference">terms of reference</a> </li> <li> <a class="drop" href="https://www.iucr.org/resources/cif/comcifs/members">members</a> </li> <li> <a class="drop" href="https://www.iucr.org/resources/cif/comcifs/policy">policy</a> </li> <li> <a class="drop" href="https://www.iucr.org/resources/cif/comcifs/list">list</a> </li> <li> <a class="drop" href="https://www.iucr.org/resources/cif/comcifs/coredmg">coredmg</a> </li> <li> <a class="drop" href="https://www.iucr.org/resources/cif/comcifs/symposium-2013">symposium 2013</a> </li> <li> <a class="drop" href="https://www.iucr.org/resources/cif/comcifs/workshop-2013">workshop 2013</a> <ul> <li> <a href="https://www.iucr.org/resources/cif/comcifs/workshop-2013/workshop-home">Workshop Home</a> </li> <li> <a href="https://www.iucr.org/resources/cif/comcifs/workshop-2013/attendees">attendees</a> </li> <li> <a href="https://www.iucr.org/resources/cif/comcifs/workshop-2013/logistics">logistics</a> </li> <li> <a href="https://www.iucr.org/resources/cif/comcifs/workshop-2013/resources">resources</a> </li> </ul> </li> <li> <a class="drop" href="https://www.iucr.org/resources/cif/comcifs/workshop-2017">workshop 2017</a> </li> <li> <a class="drop" href="https://www.iucr.org/resources/cif/comcifs/cifiesta-2019">cifiesta 2019</a> </li> <li> <a class="drop" href="https://www.iucr.org/resources/cif/comcifs/workshop-2023">workshop 2023</a> <ul> <li> <a href="https://www.iucr.org/__data/assets/pdf_file/0015/157011/handout.pdf">Programme book</a> </li> <li> <a href="https://www.iucr.org/__data/assets/pdf_file/0016/157012/IntroductionToCIFOntology.pdf">Introduction to the CIF ontology</a> </li> <li> <a href="https://www.iucr.org/__data/assets/pdf_file/0017/157013/DWW_2023_Morning.pdf">The relational underpinnings of CIF</a> </li> <li> <a href="https://www.iucr.org/__data/assets/pdf_file/0018/157014/Structure-of-a-CIF-dictionary.pdf">Structure of a CIF dictionary</a> </li> <li> <a href="https://www.iucr.org/__data/assets/pdf_file/0019/157015/WritingCIFSoftware.pdf">Strategies for writing CIF software</a> </li> <li> <a href="https://www.iucr.org/__data/assets/pdf_file/0015/157020/github.pdf">Using GitHub</a> </li> </ul> </li> <li> <a class="drop" href="https://www.iucr.org/resources/cif/comcifs/github2">github</a> </li> </ul> </li> <li><a class="drop" href="https://www.iucr.org/resources/cif/ddl">ddl</a> <ul> <li> <a class="drop" href="https://www.iucr.org/resources/cif/ddl/search">search</a> </li> <li> <a class="drop" href="https://www.iucr.org/resources/cif/ddl/ddlm">ddlm</a> </li> <li> <a class="drop" href="https://www.iucr.org/resources/cif/ddl/ddl2">ddl2</a> </li> <li> <a class="drop" href="https://www.iucr.org/resources/cif/ddl/ddl1">ddl1</a> </li> </ul> </li> <li><a class="drop" href="https://www.iucr.org/resources/cif/dictionaries">dictionaries</a> <ul> <li> <a class="drop" href="https://www.iucr.org/resources/cif/dictionaries/search">search</a> </li> <li> <a class="drop" href="https://www.iucr.org/resources/cif/dictionaries/cif_core">cif_core</a> <ul> <li> <a href="https://www.iucr.org/resources/cif/dictionaries/cif_core/diffs2.4.5-2.4.4">diffs2.4.5-2.4.4</a> </li> <li> <a href="https://www.iucr.org/resources/cif/dictionaries/cif_core/diffs2.4.3-2.4.2">diffs2.4.3-2.4.2</a> </li> <li> <a href="https://www.iucr.org/resources/cif/dictionaries/cif_core/diffs2.4.2-2.4.1">diffs2.4.2-2.4.1</a> </li> <li> <a href="https://www.iucr.org/resources/cif/dictionaries/cif_core/diffs2.4.1-2.4">diffs2.4.1-2.4</a> </li> <li> <a href="https://www.iucr.org/resources/cif/dictionaries/cif_core/diffs2.4-2.3">diffs2.4-2.3</a> </li> <li> <a href="https://www.iucr.org/resources/cif/dictionaries/cif_core/diffs2.3-2.2">diffs2.3-2.2</a> </li> <li> <a href="https://www.iucr.org/resources/cif/dictionaries/cif_core/diffs2.2-2.1">diffs2.2-2.1</a> </li> <li> <a href="https://www.iucr.org/resources/cif/dictionaries/cif_core/diffs2.1-2.0">diffs2.1-2.0</a> </li> <li> <a href="https://www.iucr.org/resources/cif/dictionaries/cif_core/diffs2.0-1.0">diffs2.0-1.0</a> </li> </ul> </li> <li> <a class="drop" href="https://www.iucr.org/resources/cif/dictionaries/cif_core_restraints">cif_core_restraints</a> </li> <li> <a class="drop" href="https://www.iucr.org/resources/cif/dictionaries/cif_pd">cif_pd</a> </li> <li> <a class="drop" href="https://www.iucr.org/resources/cif/dictionaries/cif_ms">cif_ms</a> </li> <li> <a class="drop" href="https://www.iucr.org/resources/cif/dictionaries/cif_rho">cif_rho</a> </li> <li> <a class="drop" href="https://www.iucr.org/resources/cif/dictionaries/cif_twinning">cif_twinning</a> </li> <li> <a class="drop" href="https://www.iucr.org/resources/cif/dictionaries/cif_mm">cif_mm</a> <ul> <li> <a href="https://www.iucr.org/resources/cif/dictionaries/cif_mm/diffs2.0-1.0">diffs2.0-1.0</a> </li> </ul> </li> <li> <a class="drop" href="https://www.iucr.org/resources/cif/dictionaries/cif_img">cif_img</a> </li> <li> <a class="drop" href="https://www.iucr.org/resources/cif/dictionaries/cif_sym">cif_sym</a> </li> <li> <a class="drop" href="https://www.iucr.org/resources/cif/dictionaries/cif_mag">cif_mag</a> </li> <li> <a class="drop" href="https://www.iucr.org/resources/cif/dictionaries/cif_topology">cif_topology</a> </li> </ul> </li> <li><a class="drop" href="https://www.iucr.org/resources/cif/checkcif">checkcif</a> </li> <li><a class="drop" href="https://www.iucr.org/resources/cif/cif2">cif2</a> <ul> <li> <a class="drop" href="https://www.iucr.org/__data/assets/text_file/0009/112131/CIF2-ENBF.txt">cif2_ebnf.txt</a> </li> </ul> </li> </ul> </nav> </header> </div>     <div class="wrapper row3" id="page_body"> <main class="hoc container clear">  <div class="motd"> </div>  <div class="clear">   <div id="_layout_34Q" class="content three_quarter first"></div> <div id="_layout_34" class="content three_quarter"></div> <div id="_layout_full" class="content"> <div id="content_div_11150"> <img src="https://www.iucr.org/__data/assets/image/0003/125499/CIF_v2.5.jpg" alt="[CIF logo]" style="float:left;margin-right:10px;margin-bottom:10px;width:20%;max-width:160px;min-width:64px;" />  <p>The acronym CIF is used both for the <em>Crystallographic Information File</em>, the data exchange standard file format of Hall, Allen & Brown (1991) (see <a href="https://www.iucr.org/resources/cif/documentation">Documentation</a>), and for the <em>Crystallographic Information Framework</em>, a broader system of exchange protocols based on data dictionaries and relational rules expressible in different machine-readable manifestations, including, but not restricted to, Crystallographic Information File and XML.</p> <p>CIF was developed by the IUCr Working Party on Crystallographic Information in an effort sponsored by the IUCr Commission on Crystallographic Data and the IUCr Commission on Journals, and was adopted in 1990 as a standard file structure for the archiving and distribution of crystallographic information. It is now well established and is in regular use for reporting crystal structure determinations to <em>Acta Crystallographica</em> and other journals. It is often cited as a model example of integrating data and textual information for data-centric scientific communication. In 2006 the importance of CIF and the value of its accompanying web-based service for the validation of structural data, <em>checkCIF</em>, were recognised by the Award for Publishing Innovation of the Association of Learned and Professional Society Publishers (ALPSP). In their report, the judges 'were impressed with the way in which CIF and checkCIF are easily accessible and have served to make critical crystallographic data more consistently reliable and accessible at all stages of the information chain, from authors, reviewers and editors through to readers and researchers. In doing so, the system takes away the donkeywork from ensuring that the results of scientific research are trustworthy without detracting from the value of human judgement in the research and publication process'.</p> <p>This part of the IUCr web site provides comprehensive documentation and software resources for users and developers of CIF software.<br /></p> </div> <div class="wrapper bgded overlay" style="margin-top:20px;background-image:url('/cgi-bin/getiucrphoto.php?ms=journals&no=53');"> <div class="hoc clear"> <div id="logo" class="fl_left" style="padding-top:20px;padding-bottom:20px;"> <img src="https://www.iucr.org/__data/assets/image/0015/131037/CIF_white.png" alt="[CIF logo]" style="width:66px;margin-left:10px;margin-right:10px;" /> </div> <h2>Useful resources</h2> </div> </div> <h2>General information</h2> <figure class="boxed one_third first" style="font-size:small;"><div class="one_half first" style="height:16em;"><img src="https://www.iucr.org/__data/assets/image/0018/145422/CIFiesta.jpg" style="width:100%;max-width:240px;"></div><figcaption class="one_half"><h5 style="margin-top:10px;" class="heading underline font-x1"><a href="https://www.iucr.org/resources/cif/comcifs/cifiesta-2019">CIFiesta 2019</a></h5><div style="height:5em;overflow:hidden;font-size:small;line-height:1.3;">The 2019 AIC School covered best crystallographic practice from the viewpoint of data management.</div><footer><a href="https://www.iucr.org/resources/cif/comcifs/cifiesta-2019">Read More 禄</a></footer></figcaption></figure> <figure class="boxed one_third" style="font-size:small;"><div class="one_half first" style="height:16em;"><img src="https://www.iucr.org/__data/assets/image/0003/80319/bm.jpg" style="width:100%;max-width:240px;"></div><figcaption class="one_half"><h5 style="margin-top:10px;display:flex;" class="heading underline font-x1"><a href="https://www.iucr.org/resources/cif/comcifs/symposium-2013">Crystallographic Information and Data Management</a></h5><div style="height:5em;overflow:hidden;font-size:small;line-height:1.3;">A COMCIFS symposium at the 28th European Crystallography Meeting.</div><footer><a href="https://www.iucr.org/resources/cif/comcifs/symposium-2013">Read More 禄</a></footer></figcaption></figure> <figure class="boxed one_third" style="font-size:small;"><div class="one_half first" style="height:16em;"><img src="https://www.iucr.org/__data/assets/image/0003/149502/ontology.jpg" style="width:100%;max-width:240px;"></div><figcaption class="one_half"><h5 style="margin-top:10px;" class="heading underline font-x1"><a href="https://www.iucr.org/resources/cif/ontology_hall">Implementation and Evolution of STAR/CIF Ontologies</a></h5><div style="height:5em;overflow:hidden;font-size:small;line-height:1.3;"><em>Data Science Journal</em> paper on CIF and interoperability.</div><footer><a href="https://www.iucr.org/resources/cif/ontology_hall">Read More 禄</a></footer></figcaption></figure> <h2 style="clear:both;padding-top:30px;">For software developers</h2> <a class="btn compact" style="width:23em;margin-bottom:10px;" href="https://www.iucr.org/resources/cif/cif2">CIF2 specification</a>  <a class="btn compact" style="width:23em;margin-bottom:10px;" href="https://github.com/COMCIFS/cif_core/issues/new/choose">Suggest new data name <img style="width:16px;vertical-align:baseline;" src=https://www.iucr.org/__data/assets/image/0009/149715/external-link.png /></a> <a class="btn compact" style="width:23em;margin-bottom:10px;" href="https://www.iucr.org/cgi-bin/cifreserve.pl">Register reserved prefix</a> <a class="btn compact" style="width:23em;margin-bottom:10px;" href="https://www.iucr.org/resources/lists/cif-developers">Mailing list: cif-developers</a> <h2 style="clear:both;padding-top:30px;">Standards development</h2> <a class="btn compact" style="width:23em;margin-bottom:10px;" href="https://github.com/COMCIFS">Standards development site <img style="width:16px;vertical-align:baseline;" src=https://www.iucr.org/__data/assets/image/0009/149715/external-link.png /></a> <a class="btn compact" style="width:23em;margin-bottom:10px;" href="https://www.iucr.org/resources/lists/comcifs">Mailing list: COMCIFS</a> <a class="btn compact" style="width:23em;margin-bottom:10px;" href="https://www.iucr.org/resources/lists/coredmg">Mailing list: coreDMG</a> <a class="btn compact" style="width:23em;margin-bottom:10px;" href="https://www.iucr.org/resources/lists">Other mailing lists</a> <br/><br /> </div>   <div class="sidebar one_quarter" style="float:right;"></div> <div class="sidebar one_quarter" style="float:right;"></div> </div> </main> </div>                     <div class="wrapper row1"> <div id="quicklinks" class="hoc clear">  <div class="accordion">  <a href="javascript:void(0);" class="accordiontoggle heading">Quick links</a>  <div class="linkblock group"> <div class="one_quarter first">  <ul> <li><a 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