(IUCr) CIF dictionaries

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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/dictionaries">dictionaries</a> </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 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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" 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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="current" 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_16284"> <img src="https://www.iucr.org/__data/assets/image/0003/125499/CIF_v2.5.jpg" alt="[CIF logo]" style="float:right;margin-left:10px;margin-bottom:10px;width:20%;max-width:120px;min-width:64px;" /> <h1>CIF dictionaries</h1> <p>CIF dictionaries provide a formal taxonomy of crystallographic terms and ideas. Dictionary entries are constructed in a structured machine-readable manner that facilitates validation and structuring of data. New entries may be devised for public or private dictionaries. A candidate data-name definition should fulfil the following conditions: (i) describe a specific and well defined concept: precision of definition is essential for an effective interchange mechanism; (ii) have appropriate granularity: data names can define a very small piece of information (a standard uncertainty on a particular physical measurable) or a very large amount (the text of a scientific paper); (iii) have well defined relationships with other data items (through its assigned category membership and parent/child links); (iv) constraints on the data type and permissible values should be provided where applicable; (v) the name chosen should be globally unique; this is achieved through monitoring of names in public dictionaries by a regulatory committee (COMCIFS) and by registering of prefix strings for exclusive use in local dictionaries.</p> <p>See also:</p> <p>McMahon, B. (2006). <em>General considerations when defining a CIF data item. International Tables for Crystallography</em>, Vol. G. <em>Definition and exchange of crystallographic data</em>, 1st online ed., ch. 3.1, pp. 73-91. Chester: International Union of Crystallography. [<a href="http://dx.doi.org/10.1107/97809553602060000733">doi: 10.1107/97809553602060000733</a>]</p> <h2>Current CIF Dictionaries</h2> <p>The CIF dictionaries listed below belong to a single namespace. They include dictionaries that are maintained by COMCIFS, as well as dictionaries maintained by other trusted organisations. A machine-readable register of CIF dictionaries maintained by the IUCr is <a href="https://www.iucr.org/__data/iucr/cif/dictionaries/cifdic.register">available</a>.</p> <h3>Descriptors for diffraction techniques and small-molecule, inorganic and other small-unit-cell structures<br /></h3> <p>The following dictionaries are maintained by COMCIFS through interactions with the the relevant communities. Please note that most of these dictionaries are in the process of being updated to the new DDLm dictionary language standard. This change over to DDLm does not affect the meaning of datanames used in CIF data files.</p> <ul> <li>Core dictionary (coreCIF) (DDLm compliant)<br /> [ <a href="https://www.iucr.org/__data/iucr/cif/dictionaries/cif_core_3.2.0.dic">ASCII</a> | <a href="https://publbio.iucr.org/cifdic/dichtm.php?dic=cif_core">Category tree</a> | <a href="https://www.iucr.org/resources/cif/dictionaries/cif_core">More information</a> ]</li> <li>Multiblock Core dictionary (multiblock coreCIF) (DDLm compliant)<br /> [ <a href="https://www.iucr.org/__data/iucr/cif/dictionaries/cif_core_multiblock_1.0.0.dic">ASCII</a> | <a href="https://publbio.iucr.org/cifdic/dichtm.php?dic=cif_core_multiblock">Category tree</a> ]</li> <li>Core dictionary (coreCIF) (DDL1 compliant)<br /> [ <a href="https://www.iucr.org/__data/iucr/cif/dictionaries/cif_core.dic">ASCII</a> | <a href="https://www.iucr.org/cif/cifdic_html/1/cif_core.dic/index.html">HTML</a> | <a href="https://www.iucr.org/__data/iucr/cif/dictionaries/cif_core_2.4.2.dic.pdf">PDF</a> | <a href="https://www.iucr.org/resources/cif/dictionaries/cif_core">More information</a> ]</li> <li>Restraints dictionary<br /> [ <a href="https://www.iucr.org/__data/iucr/cif/dictionaries/cif_core_restraints.dic">ASCII</a> | <a href="https://www.iucr.org/cif/cifdic_html/1/cif_core_restraints.dic/index.html">HTML</a> | <a href="https://www.iucr.org/__data/iucr/cif/dictionaries/cif_core_restraints_1.0.pdf">PDF</a>  | <a href="https://www.iucr.org/resources/cif/dictionaries/cif_core_restraints">More information</a> ]</li> <li>Powder dictionary (pdCIF)<br /> [ <a href="https://www.iucr.org/__data/iucr/cif/dictionaries/cif_pd.dic">ASCII</a> | <a href="https://www.iucr.org/cif/cifdic_html/1/cif_pd.dic/index.html">HTML</a> | <a href="https://www.iucr.org/__data/iucr/cif/dictionaries/cif_pd_1.0.1.dic.pdf">PDF</a> | <a href="https://www.iucr.org/resources/cif/dictionaries/cif_pd">More information</a> ]</li> <li>Modulated and composite structures dictionary (msCIF)<br /> [ <a href="https://www.iucr.org/__data/iucr/cif/dictionaries/cif_ms.dic">ASCII</a> | <a href="https://www.iucr.org/cif/cifdic_html/1/cif_ms.dic/index.html">HTML</a> | <a href="https://www.iucr.org/__data/iucr/cif/dictionaries/cif_ms_1.0.1.dic.pdf">PDF</a> | <a href="https://www.iucr.org/resources/cif/dictionaries/cif_ms">More information</a> ]</li> <li>Electron density dictionary (rhoCIF)<br /> [ <a href="https://www.iucr.org/__data/iucr/cif/dictionaries/cif_rho.dic">ASCII</a> | <a href="https://www.iucr.org/cif/cifdic_html/1/cif_rho.dic/index.html">HTML</a> | <a href="https://www.iucr.org/__data/iucr/cif/dictionaries/cif_rho_1.0.1.dic.pdf">PDF</a> | <a href="https://www.iucr.org/resources/cif/dictionaries/cif_rho">More information</a> ]</li> <li>Twinning dictionary<br /> [ <a href="https://www.iucr.org/__data/iucr/cif/dictionaries/cif_twinning.dic">ASCII</a> | <a href="https://www.iucr.org/cif/cifdic_html/1/cif_twinning.dic/index.html">HTML</a> | <a href="https://www.iucr.org/__data/iucr/cif/dictionaries/cif_twinning_1.0.dic.pdf">PDF</a> | <a href="https://www.iucr.org/resources/cif/dictionaries/cif_twinning">More information</a> ]</li> <li>Magnetic dictionary (magCIF)<br /> [<a href="https://www.iucr.org/__data/iucr/cif/dictionaries/cif_mag.dic">ASCII</a> | <a href="https://www.iucr.org/__data/iucr/cifdic_html/3/MAGNETIC_CIF/index.html">HTML</a> | <a href="https://www.iucr.org/__data/iucr/cif/dictionaries/cif_mag_0.9.8.dic.pdf">PDF</a> | <a href="https://www.iucr.org/resources/cif/dictionaries/cif_mag">More information</a> ]</li> <li>Topology dictionary (topoCIF)<br /> [<a href="https://www.iucr.org/__data/iucr/cif/dictionaries/cif_topology.dic">ASCII</a> | <a href="https://www.iucr.org/__data/iucr/cifdic_html/3/TOPOLOGY_CIF/index.html">HTML</a> | <a href="https://www.iucr.org/__data/iucr/cif/dictionaries/cif_topology_0.9.1.dic.pdf">PDF</a> | <a href="https://www.iucr.org/resources/cif/dictionaries/cif_topology">More information</a> ]</li> <li>Image dictionary (imgCIF)<br /> [ <a href="https://www.iucr.org/__data/iucr/cif/dictionaries/cif_img.dic">ASCII</a> | <a href="https://www.iucr.org/cif/cifdic_html/2/cif_img.dic/index.html">HTML</a> | <a href="https://www.iucr.org/__data/iucr/cif/dictionaries/cif_img_1.3.2.dic.pdf">PDF</a> | <a href="https://www.iucr.org/resources/cif/dictionaries/cif_img">More information</a> ]</li> <li>Symmetry dictionary (symCIF)<br /> [ <a href="https://www.iucr.org/__data/iucr/cif/dictionaries/cif_sym.dic">ASCII</a> | <a href="https://www.iucr.org/cif/cifdic_html/2/cif_sym.dic/index.html">HTML</a> | <a href="https://www.iucr.org/__data/iucr/cif/dictionaries/cif_sym_1.0.1.dic.pdf">PDF</a> | <a href="https://www.iucr.org/resources/cif/dictionaries/cif_sym">More information</a> ]</li> </ul> <h3>Descriptors for macromolecular structures and associated experiments<br /></h3> <p>The wwPDB independently maintains a set of dictionaries for describing macromolecular structures and associated experimental measurements.  Macromolecular users should refer to the <a href="http://mmcif.wwpdb.org/pdbx-mmcif-home-page.html">wwPDB mmCIF website</a> for reference materials and dictionaries. The IUCr also archives a core set of mmCIF definitions.<br /></p> <ul> <li>Macromolecular dictionary (mmCIF)<br /> [ <a href="https://www.iucr.org/__data/iucr/cif/dictionaries/cif_mm.dic">ASCII</a> | <a href="https://www.iucr.org/cif/cifdic_html/2/cif_mm.dic/index.html">HTML</a> | <a href="https://www.iucr.org/__data/iucr/cif/dictionaries/cif_mm_2.0.09.dic.pdf">PDF</a> | <a href="https://www.iucr.org/resources/cif/dictionaries/cif_mm">More information</a> ]</li> <li><a href="http://mmcif.wwpdb.org/dictionaries/downloads.html">wwPDB dictionary list</a><br /></li> </ul> </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/dictionaries/search">Search for CIF data name</a></li><li><a href="https://www.iucr.org/resources/cif/dictionaries/cif_core">Core CIF dictionary</a></li><li><a href="https://www.iucr.org/resources/cif/dictionaries/cif_core_restraints">Restraints dictionary</a></li><li><a href="https://www.iucr.org/resources/cif/dictionaries/cif_pd">Powder CIF dictionary</a></li><li><a href="https://www.iucr.org/resources/cif/dictionaries/cif_ms">Modulated structures CIF dictionary</a></li><li><a href="https://www.iucr.org/resources/cif/dictionaries/cif_rho">Electron density CIF dictionary</a></li><li><a href="https://www.iucr.org/resources/cif/dictionaries/cif_twinning">Twinning CIF dictionary</a></li><li><a href="https://www.iucr.org/resources/cif/dictionaries/cif_mm">Macromolecular CIF dictionary</a></li><li><a href="https://www.iucr.org/resources/cif/dictionaries/cif_img">Image CIF dictionary</a></li><li><a href="https://www.iucr.org/resources/cif/dictionaries/cif_sym">Symmetry CIF dictionary</a></li><li><a href="https://www.iucr.org/resources/cif/dictionaries/cif_mag">Magnetic CIF dictionary</a></li><li><a href="https://www.iucr.org/resources/cif/dictionaries/cif_topology">Topology CIF dictionary</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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