(IUCr) Specifications

<!DOCTYPE html>   <html> <head> <script src="https://journals.iucr.org/javascript/analytics.js"></script> <title>(IUCr) Specifications</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="Specifications"> <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 href="https://www.iucr.org/__data/assets/css_file/0011/129764/iucr.css?v=0.1.206" rel="stylesheet" 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onload="onLoad();window.focus();tabberAutomatic();">    <div class="wrapper row0"> <div id="topbar" class="clear">  <div class="fl_left"> <ul class="nospace inline pushright"> <li> </li> <li><a href="/welcome.html"><img src=https://www.iucr.org/__data/assets/image/0008/130301/IUCr-logo-White.png style="width:23px;" /></a></li> <li><a href="//journals.iucr.org/"><img src=https://www.iucr.org/__data/assets/image/0012/130305/iucr_journals_white.png style="width:22px;" /></a></li> <li><i class="fa fa-user"></i> <a href="https://www.iucr.org/people/login">Login</a></li> </ul> </div> <div class="fl_right"> <ul class="faico clear">  <li><form method="GET" action="https://www.iucr.org/cgi-bin/iucrsearch" enctype="application/x-www-form-urlencoded" class="form"><input maxlength="200" value="" name="query" class="inlinesearch" type="text" size="16"><input value="Search" name="submit" style="display:none;" type="submit"><br> </form><img 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<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 associates</a> </li> <li> <a href="https://www.iucr.org/iucr/ab.html/scientific-associates">scientific associates</a> </li> <li> <a href="https://www.iucr.org/iucr/ab.html/other-bodies">other bodies</a> </li> </ul> </li> <li> <a class="drop" href="https://www.iucr.org/iucr/commissions">commissions</a> <ul> <li> <a href="https://www.iucr.org/iucr/commissions/principles">principles</a> </li> <li> <a href="https://www.iucr.org/iucr/commissions/aperiodic-crystals">aperiodic crystals</a> </li> <li> <a href="https://www.iucr.org/iucr/commissions/biological-macromolecules">biological macromolecules</a> </li> <li> <a href="https://www.iucr.org/iucr/commissions/crystal-growth">crystal growth and characterization of materials</a> </li> <li> <a href="https://www.iucr.org/iucr/commissions/crystallographic-computing">crystallographic computing</a> </li> <li> <a href="https://www.iucr.org/iucr/commissions/nomenclature">crystallographic nomenclature</a> </li> <li> <a 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> <li> <a href="https://www.iucr.org/iucr/commissions/magnetic-structures">magnetic structures</a> </li> <li> <a href="https://www.iucr.org/iucr/commissions/mathematical-and-theoretical-crystallography">mathematical and theoretical crystallography</a> </li> <li> <a href="https://www.iucr.org/iucr/commissions/neutron-scattering">neutron scattering</a> </li> <li> <a href="https://www.iucr.org/iucr/commissions/nmr-crystallography">nmr crystallography</a> </li> <li> <a href="https://www.iucr.org/iucr/commissions/powder-diffraction">powder diffraction</a> </li> <li> <a href="https://www.iucr.org/iucr/commissions/quantum-crystallography">quantum crystallography</a> </li> <li> <a href="https://www.iucr.org/iucr/commissions/small-angle-scattering">small-angle scattering</a> </li> <li> <a href="https://www.iucr.org/iucr/commissions/structural-chemistry">structural chemistry</a> </li> <li> <a href="https://www.iucr.org/iucr/commissions/synchrotron-radiation">synchrotron and xfel radiation</a> </li> <li> <a href="https://www.iucr.org/iucr/commissions/xafs">xafs</a> </li> </ul> </li> <li> <a class="drop" href="https://www.iucr.org/iucr/principles-and-policies">policies</a> </li> <li> <a class="drop" href="https://www.iucr.org/iucr/ewald-prize">ewald prize</a> </li> <li> <a class="drop" href="https://www.iucr.org/iucr/bragg-prize">bragg prize</a> </li> <li> <a class="drop" href="https://www.iucr.org/iucr/struchkov-prize">struchkov prize</a> </li> <li> <a class="drop" href="https://www.iucr.org/iucr/cong">congress</a> <ul> <li> <a href="https://www.iucr.org/iucr/cong/2029-iucr-xxviii">2029 iucr xxviiI</a> </li> <li> <a href="https://www.iucr.org/iucr/cong/2026-iucr-xxvii">2026 iucr xxvii</a> </li> <li> <a href="https://www.iucr.org/iucr/cong/2023-iucr-xxvi">2023 iucr xxvi</a> </li> <li> <a href="https://www.iucr.org/iucr/cong/iucr-xxv">2021 iucr xxv</a> </li> <li> <a href="https://www.iucr.org/iucr/cong/iucr-xxiv">2017 iucr xxiv</a> </li> <li> <a 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/sponsorship">support</a> <ul> <li> <a href="https://www.iucr.org/iucr/sponsorship/vp.html">visiting professorships</a> </li> <li> <a href="https://www.iucr.org/iucr/sponsorship/meetings.html">meetings</a> </li> <li> <a href="https://www.iucr.org/iucr/sponsorship/crystallography-in-africa">africa</a> </li> <li> <a href="https://www.iucr.org/iucr/sponsorship/iucr-outreach-fund">outreach and education</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/extension">extension</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 issues</a> </li> <li> <a href="https://www.iucr.org/news/whats-new/meetings">meetings</a> </li> <li> <a href="https://www.iucr.org/news/whats-new/software">software</a> </li> </ul> </li> <li> <a class="drop" href="https://www.iucr.org/news/newsletter">newsletter</a> <ul> <li> <a href="https://www.iucr.org/news/newsletter/index">index</a> </li> <li> <a href="https://www.iucr.org/news/newsletter/archive">archive</a> </li> <li> <a href="https://www.iucr.org/news/newsletter/editorial-board">editorial board</a> </li> <li> <a href="https://www.iucr.org/news/newsletter/volume-32">volume 32</a> </li> <li> <a href="https://www.iucr.org/news/newsletter/volume-31">volume 31</a> </li> <li> <a href="https://www.iucr.org/news/newsletter/volume-30">volume 30</a> </li> <li> <a href="https://www.iucr.org/news/newsletter/volume-29">volume 29</a> </li> <li> <a href="https://www.iucr.org/news/newsletter/volume-28">volume 28</a> </li> <li> <a href="https://www.iucr.org/news/newsletter/volume-27">volume 27</a> </li> <li> <a href="https://www.iucr.org/news/newsletter/volume-26">volume 26</a> </li> <li> <a href="https://www.iucr.org/news/newsletter/volume-25">volume 25</a> </li> <li> <a href="https://www.iucr.org/news/newsletter/volume-24">volume 24</a> </li> <li> <a href="https://www.iucr.org/news/newsletter/volume-23">volume 23</a> </li> <li> <a href="https://www.iucr.org/news/newsletter/volume-22">volume 22</a> </li> <li> <a href="https://www.iucr.org/news/newsletter/volume-21">volume 21</a> </li> <li> <a href="https://www.iucr.org/news/newsletter/volume-20">volume 20</a> </li> <li> <a href="https://www.iucr.org/news/newsletter/volume-19">volume 19</a> </li> <li> <a href="https://www.iucr.org/news/newsletter/volume-18">volume 18</a> </li> <li> <a href="https://www.iucr.org/news/newsletter/volume-17">volume 17</a> </li> <li> <a href="https://www.iucr.org/news/newsletter/volume-16">volume 16</a> </li> <li> <a href="https://www.iucr.org/news/newsletter/volume-15">volume 15</a> </li> <li> <a href="https://www.iucr.org/news/newsletter/volume-14">volume 14</a> </li> <li> <a href="https://www.iucr.org/news/newsletter/volume-13">volume 13</a> </li> <li> <a href="https://www.iucr.org/news/newsletter/volume-12">volume 12</a> </li> <li> <a href="https://www.iucr.org/news/newsletter/volume-11">volume 11</a> </li> <li> <a href="https://www.iucr.org/news/newsletter/volume-10">volume 10</a> </li> <li> <a href="https://www.iucr.org/news/newsletter/volume-9">volume 9</a> </li> <li> <a href="https://www.iucr.org/news/newsletter/volume-8">volume 8</a> </li> <li> <a href="https://www.iucr.org/news/newsletter/volume-7">volume 7</a> </li> <li> <a href="https://www.iucr.org/news/newsletter/volume-6">volume 6</a> </li> <li> <a href="https://www.iucr.org/news/newsletter/volume-5">volume 5</a> </li> <li> <a href="https://www.iucr.org/news/newsletter/volume-4">volume 4</a> </li> <li> <a href="https://www.iucr.org/news/newsletter/volume-3">volume 3</a> </li> <li> <a href="https://www.iucr.org/news/newsletter/volume-2">volume 2</a> </li> <li> <a href="https://www.iucr.org/news/newsletter/volume-1">volume 1</a> </li> <li> <a href="https://www.iucr.org/news/newsletter/advertise">advertise</a> </li> <li> <a href="https://www.iucr.org/news/newsletter/submit">submit</a> </li> </ul> </li> <li> <a class="drop" href="https://www.iucr.org/news/announcements">announcements</a> </li> <li> <a class="drop" href="https://www.iucr.org/news/jobs">jobs</a> </li> <li> <a class="drop" href="https://www.iucr.org/news/meetings">meetings</a> </li> <li> <a class="drop" href="https://www.iucr.org/news/meeting-reports">meeting reports</a> <ul> <li> <a href="https://www.iucr.org/news/meeting-reports/21st-iucr-congress">21st iucr congress</a> </li> <li> <a href="https://www.iucr.org/news/meeting-reports/iucr-newsletter">iucr newsletter</a> </li> <li> <a href="https://www.iucr.org/news/meeting-reports/meeting-reports">data-related meetings</a> </li> <li> <a href="https://www.iucr.org/news/meeting-reports/sponsored-meetings">sponsored meetings</a> </li> <li> <a href="https://www.iucr.org/news/meeting-reports/by-country">by country</a> </li> </ul> </li> <li> <a class="drop" href="https://www.iucr.org/news/rss-feeds">rss feeds</a> </li> </ul> </li> <li><a class="drop" href="https://www.iucr.org/publications">publications</a> <ul> <li> <a class="drop" href="https://www.iucr.org/publications/journals">IUCr Journals</a> <ul> <li> <a href="https://www.iucr.org/publications/journals/acta-a">Acta A</a> </li> <li> <a href="https://www.iucr.org/publications/journals/acta-b">Acta B</a> </li> <li> <a href="https://www.iucr.org/publications/journals/acta-c">Acta C</a> </li> <li> <a href="https://www.iucr.org/publications/journals/acta-d">Acta D</a> </li> <li> <a href="https://www.iucr.org/publications/journals/acta-e">Acta E</a> </li> <li> <a href="https://www.iucr.org/publications/journals/acta-f">Acta F</a> </li> <li> <a href="https://www.iucr.org/publications/journals/iucrj">IUCrJ</a> </li> <li> <a href="https://www.iucr.org/publications/journals/jac">JAC</a> </li> <li> <a href="https://www.iucr.org/publications/journals/jsr">JSR</a> </li> <li> <a href="https://www.iucr.org/publications/journals/iucrdata">IUCrData</a> </li> </ul> </li> <li> <a class="drop" 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</li> <li> <a href="https://www.iucr.org/outreach/openlabs/bruker-openlab-tunisia">Bruker OpenLab Tunisia</a> </li> <li> <a href="https://www.iucr.org/outreach/openlabs/bruker-openlab-algeria">Bruker OpenLab Algeria</a> </li> <li> <a href="https://www.iucr.org/outreach/openlabs/panalytical-openlab-turkey">PANalytical OpenLab Turkey</a> </li> <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/rigaku-openlab-colombia">Rigaku OpenLab Colombia</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-indonesia">Bruker OpenLab Indonesia</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/crystal-growing-competition">crystal growing competition</a> <ul> <li> <a 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-28px;margin-right: 10px;" /></a> </div> <h2><a href="https://www.iucr.org/resources/cif" title="[CIF home page]">Crystallographic Information Framework</a></h2> </div> </div>           <div id="breadcrumb"> <a href="https://www.iucr.org">iucr</a>  >  <a href="https://www.iucr.org/resources">resources</a>  >  <a href="https://www.iucr.org/resources/cif">cif</a>  >  <a href="https://www.iucr.org/resources/cif/spec">specification</a> </div>     <div class="wrapper row3"> <header id="minisite" class="hoc"> <nav id="mainav2" class="fl_right"> <ul class="clear"> <li><a class="current" 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 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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 id="content_div_11159"> <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;" /> <h1>Specifications</h1> <p>These pages provide the formal specification of the Crystallographic Information Framework file format.</p> <p>Two closely-related syntaxes are available: <a href="https://www.iucr.org/resources/cif/spec/version1.1">version 1.1</a> and <a href="https://www.iucr.org/resources/cif/cif2">version 2.0</a>. The version number 1.0 was assigned retrospectively to the version described in the original paper of <a href="http://www.iucr.org/paper?es0164">Hall, Allen & Brown (1991)</a>, as <a href="https://www.iucr.org/resources/cif/dictionaries/cif_core/diffs2.0-1.0">amended</a> by COMCIFS 29 January 1997.</p> <p>In addition to the formal specification, a number of ancillary notes are published that describe conventions or guidelines applied within one or more of the dictionaries of CIF data items that are used in various topic areas. These notes should be adhered to as closely as possible, in association with the formal specification of file syntax and implied semantics, to maximise the efficient interoperability of CIF-based applications.</p> </div> </div> <div id="_layout_34" class="content three_quarter"></div> <div id="_layout_full" class="content"></div>   <div class="sidebar one_quarter" style="float:right;"></div> <style type="text/css">div#_layout_34{display:none;}/* allows proper flow */</style> <div class="sidebar one_quarter"> <nav class="sdb_holder"> <ul> <li><a href="https://www.iucr.org/resources/cif/spec/cif-2-development">CIF 2 syntax specification</a></li><li><a href="https://www.iucr.org/resources/cif/spec/version1.1">CIF 1.1 syntax specification</a></li><li><a href="https://www.iucr.org/resources/cif/spec/ancillary">Ancillary notes</a></li><li><a href="https://www.iucr.org/resources/cif/spec/star-file">STAR File</a></li><li><a href="https://www.iucr.org/resources/cif/spec/ddl">Dictionary Definition Language</a></li> </ul> </nav> </div> <div class="sidebar one_quarter" style="float:right;"> <div class="subsidiary highlight" id="content_div_11154"> <h1>International Tables for Crystallography</h1> <h3>Volume G: Definition and exchange of crystallographic data</h3> <p><a href="http://dx.doi.org/10.1107/97809553602060000107" target="_blank">First online edition (2006)</a></p> <h6>Edited by S. R. Hall and B. McMahon</h6> <table id="maincontentstable" class="invisible"> <tbody> <tr> <td rowspan="5"><img src="https://www.iucr.org/__data/assets/image/0014/11156/g.gif" alt="[International Tables Vol. G]" style="border:1px solid grey;width:100px;" width="75" /></td> <td rowspan="5"> </td> <td><a href="https://it.iucr.org/Ga/contents/" target="_blank"><strong>contents</strong></a></td> </tr> <tr> <td><span><a href="https://it.iucr.org/Ga/Gaindex.pdf" target="_blank">indexes</a></span></td> </tr> <tr> <td><a href="https://www.iucr.org/iucr-top/it/general/itg.pdf" target="_blank">sample pages</a></td> </tr> <tr> <td><a href="https://it.iucr.org/services/purchase/" target="_blank">purchase</a></td> </tr> <tr> <td><a href="https://it.iucr.org/Ga/resources/" target="_blank">CIF dictionaries</a></td> </tr> </tbody> </table> <p>An essential guide and reference to CIF for programmers, data managers handling crystal-structure information and practising crystallographers.</p> </div> <div class="subsidiary 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