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The quality and accuracy of machine translation can vary significantly from one text to another. Read the page in original English <a onclick="goToLanguage('en')">here</a>.</div> <script type="text/javascript">/*<![CDATA[*/ // Determine if machine translation message should be shown function displayMachineTranslationMessage() { // Show if Italian, excluding certain pages if (thisSiteLanguage == 'it' && !document.querySelector('.columbia-page-home')) { document.querySelector('#machine-translation-message').style.display = null; } } displayMachineTranslationMessage();/*]]>*/</script> </div> <div class="mt-content-side"></div> <div id="mt-toc-container" data-title="Table of contents" data-collapsed="true"> <button class="mt-toggle mt-summary-toggle ui-button-icon mt-toggle-expand">Table of contents</button> <div class="mt-toc-content mt-collapsible-section mt-toc-hide"> <em>No headers</em> </div> </div> <div id="page-top"> <div id="topic"> <div id="pageText"> <div class="mt-help-search mt-lsf-search" id="mt-portfolio-search"><script type="application/json" id="mt-localizations-help-widget">/*<![CDATA[*/{"Help.Widget.button.text":"Search","Help.Widget.label.text":"Query","Help.Widget.placeholder.text":"Search OCLC-MARC records"}/*]]>*/</script><div class="mt-inputredirect" data-query-key="q" data-path="Metadata_Services/OCLC_MARC_records"></div></div> <div class="mt-page-summary"><div class="mt-page-overview">OCLC-MARC records describes records produced since November 1993. It also lists documentation that describes records produced before November 1993.</div></div> <div class="mt-category-container mt-subpage-listings-container noindex"><ul class="mt-sortable-listings-container " id="mt-sortable" data-user-can-edit="false" data-page-id="8480"><li class="mt-sortable-listing mt-sortable-listing-detailed " data-page-id="8481"><dl class="mt-listing-detailed mt-edit-section"><dt class="mt-listing-detailed-title"><a class="internal" href="https://help.oclc.org/Metadata_Services/OCLC_MARC_records/Get_started" rel="internal"><span class="mt-icon-article-topic-guide"></span>Get started</a></dt><dd class="mt-listing-detailed-image mt-hide-image"><a class="internal" href="https://help.oclc.org/Metadata_Services/OCLC_MARC_records/Get_started" rel="internal"><span class="mt-sortable-listing-image mt-image-placeholder"><span>No image available</span></span></a></dd><dd class="mt-listing-detailed-overview">Get started with OCLC-MARC records.</dd><dd class="mt-listing-detailed-subpages"><ul class="mt-listings-simple mt-listing-article-list mt-topic-hierarchy-listings mt-guide-listings"><li class="mt-show-more-listing"><a title="About OCLC-MARC records" class="mt-listing-detailed-subpage-title internal" href="https://help.oclc.org/Metadata_Services/OCLC_MARC_records/Get_started/About_OCLC_MARC_records" rel="internal"><span class="mt-icon-article-topic"></span>About OCLC-MARC records</a></li></ul></dd></dl></li><li class="mt-sortable-listing mt-sortable-listing-detailed " data-page-id="8482"><dl class="mt-listing-detailed mt-edit-section"><dt class="mt-listing-detailed-title"><a class="internal" href="https://help.oclc.org/Metadata_Services/OCLC_MARC_records/Record_structure" rel="internal"><span class="mt-icon-article-topic-guide"></span>Record structure</a></dt><dd class="mt-listing-detailed-image mt-hide-image"><a class="internal" href="https://help.oclc.org/Metadata_Services/OCLC_MARC_records/Record_structure" rel="internal"><span class="mt-sortable-listing-image mt-image-placeholder"><span>No image available</span></span></a></dd><dd class="mt-listing-detailed-overview">Find the basic structure for the leader, the directory, and the control and variable fields in OCLC-MARC bibliographic and authority records.</dd><dd class="mt-listing-detailed-subpages"><ul class="mt-listings-simple mt-listing-article-list mt-topic-hierarchy-listings mt-guide-listings"><li class="mt-show-more-listing"><a title="About record structure" class="mt-listing-detailed-subpage-title internal" href="https://help.oclc.org/Metadata_Services/OCLC_MARC_records/Record_structure/00About_record_structure" rel="internal"><span class="mt-icon-article-topic"></span>About record structure</a></li><li class="mt-show-more-listing"><a title="General structure" class="mt-listing-detailed-subpage-title internal" href="https://help.oclc.org/Metadata_Services/OCLC_MARC_records/Record_structure/010General_structure" rel="internal"><span class="mt-icon-article-topic"></span>General structure</a></li><li class="mt-show-more-listing"><a title="Leader" class="mt-listing-detailed-subpage-title internal" href="https://help.oclc.org/Metadata_Services/OCLC_MARC_records/Record_structure/020Leader" rel="internal"><span class="mt-icon-article-topic"></span>Leader</a></li><li class="mt-show-more-listing"><a title="Directory" class="mt-listing-detailed-subpage-title internal" href="https://help.oclc.org/Metadata_Services/OCLC_MARC_records/Record_structure/030Directory" rel="internal"><span class="mt-icon-article-topic"></span>Directory</a></li><li class="mt-show-more-listing"><a title="Control and variable fields" class="mt-listing-detailed-subpage-title internal" href="https://help.oclc.org/Metadata_Services/OCLC_MARC_records/Record_structure/040Control_and_variable_fields" rel="internal"><span class="mt-icon-article-topic"></span>Control and variable fields</a></li></ul></dd></dl></li><li class="mt-sortable-listing mt-sortable-listing-detailed " data-page-id="8483"><dl class="mt-listing-detailed mt-edit-section"><dt class="mt-listing-detailed-title"><a class="internal" href="https://help.oclc.org/Metadata_Services/OCLC_MARC_records/Content_designators_for_bibliographic_data" rel="internal"><span class="mt-icon-article-topic-category"></span>Content designators for bibliographic data</a></dt><dd class="mt-listing-detailed-image mt-hide-image"><a class="internal" href="https://help.oclc.org/Metadata_Services/OCLC_MARC_records/Content_designators_for_bibliographic_data" rel="internal"><span class="mt-sortable-listing-image mt-image-placeholder"><span>No image available</span></span></a></dd><dd class="mt-listing-detailed-overview">Find the elements of the leader, the directory, and the control and variable fields in OCLC-MARC bibliographic records.</dd><dd class="mt-listing-detailed-subpages"><ul class="mt-listings-simple mt-listing-article-list mt-topic-hierarchy-listings mt-guide-listings"><li class="mt-show-more-listing"><a title="Bibliographic record directory" class="mt-listing-detailed-subpage-title internal" href="https://help.oclc.org/Metadata_Services/OCLC_MARC_records/Content_designators_for_bibliographic_data/10Bibliographic_record_directory" rel="internal"><span class="mt-icon-article-topic-guide"></span>Bibliographic record directory</a></li><li class="mt-show-more-listing"><a title="Bibliographic record variable fields" class="mt-listing-detailed-subpage-title internal" href="https://help.oclc.org/Metadata_Services/OCLC_MARC_records/Content_designators_for_bibliographic_data/30Bibliographic_record_variable_fields" rel="internal"><span class="mt-icon-article-topic-guide"></span>Bibliographic record variable fields</a></li><li class="mt-show-more-listing"><a title="Bibliographic record control field" class="mt-listing-detailed-subpage-title internal" href="https://help.oclc.org/Metadata_Services/OCLC_MARC_records/Content_designators_for_bibliographic_data/Bibliographic_record_control_field" rel="internal"><span class="mt-icon-article-topic-guide"></span>Bibliographic record control field</a></li><li class="mt-show-more-listing"><a title="Bibliographic record leader" class="mt-listing-detailed-subpage-title internal" href="https://help.oclc.org/Metadata_Services/OCLC_MARC_records/Content_designators_for_bibliographic_data/Bibliographic_record_leader" rel="internal"><span class="mt-icon-article-topic-guide"></span>Bibliographic record leader</a></li></ul></dd></dl></li><li class="mt-sortable-listing mt-sortable-listing-detailed " data-page-id="8484"><dl class="mt-listing-detailed mt-edit-section"><dt class="mt-listing-detailed-title"><a class="internal" href="https://help.oclc.org/Metadata_Services/OCLC_MARC_records/Content_designators_for_authority_data" rel="internal"><span class="mt-icon-article-topic-category"></span>Content designators for authority data</a></dt><dd class="mt-listing-detailed-image mt-hide-image"><a class="internal" href="https://help.oclc.org/Metadata_Services/OCLC_MARC_records/Content_designators_for_authority_data" rel="internal"><span class="mt-sortable-listing-image mt-image-placeholder"><span>No image available</span></span></a></dd><dd class="mt-listing-detailed-overview">Find the elements of the leader, the directory, and the control and variable fields in OCLC-MARC authority records.</dd><dd class="mt-listing-detailed-subpages"><ul class="mt-listings-simple mt-listing-article-list mt-topic-hierarchy-listings mt-guide-listings"><li class="mt-show-more-listing"><a title="Authority record variable fields" class="mt-listing-detailed-subpage-title internal" href="https://help.oclc.org/Metadata_Services/OCLC_MARC_records/Content_designators_for_authority_data/30Authority_record_variable_fields" rel="internal"><span class="mt-icon-article-topic-guide"></span>Authority record variable fields</a></li><li class="mt-show-more-listing"><a title="Authority control field" class="mt-listing-detailed-subpage-title internal" href="https://help.oclc.org/Metadata_Services/OCLC_MARC_records/Content_designators_for_authority_data/Authority_control_field" rel="internal"><span class="mt-icon-article-topic-guide"></span>Authority control field</a></li><li class="mt-show-more-listing"><a title="Authority record directory" class="mt-listing-detailed-subpage-title internal" href="https://help.oclc.org/Metadata_Services/OCLC_MARC_records/Content_designators_for_authority_data/Authority_record_directory" rel="internal"><span class="mt-icon-article-topic-guide"></span>Authority record directory</a></li><li class="mt-show-more-listing"><a title="Authority record leader" class="mt-listing-detailed-subpage-title internal" href="https://help.oclc.org/Metadata_Services/OCLC_MARC_records/Content_designators_for_authority_data/Authority_record_leader" rel="internal"><span class="mt-icon-article-topic-guide"></span>Authority record leader</a></li><li class="mt-show-more-listing"><a title="Control subfield &Dagger;w" class="mt-listing-detailed-subpage-title internal" href="https://help.oclc.org/Metadata_Services/OCLC_MARC_records/Content_designators_for_authority_data/Control_subfield_%E2%80%A1w" rel="internal"><span class="mt-icon-article-topic-guide"></span>Control subfield &Dagger;w</a></li></ul></dd></dl></li><li class="mt-sortable-listing mt-sortable-listing-detailed " data-page-id="8485"><dl class="mt-listing-detailed mt-edit-section"><dt class="mt-listing-detailed-title"><a class="internal" href="https://help.oclc.org/Metadata_Services/OCLC_MARC_records/Content_designators_for_holdings_data" rel="internal"><span class="mt-icon-article-topic-guide"></span>Content designators for holdings data</a></dt><dd class="mt-listing-detailed-image mt-hide-image"><a class="internal" href="https://help.oclc.org/Metadata_Services/OCLC_MARC_records/Content_designators_for_holdings_data" rel="internal"><span class="mt-sortable-listing-image mt-image-placeholder"><span>No image available</span></span></a></dd><dd class="mt-listing-detailed-overview">Find information about content designators for holdings fields.</dd><dd class="mt-listing-detailed-subpages"><ul class="mt-listings-simple mt-listing-article-list mt-topic-hierarchy-listings mt-guide-listings"></ul></dd></dl></li><li class="mt-sortable-listing mt-sortable-listing-detailed " data-page-id="8487"><dl class="mt-listing-detailed mt-edit-section"><dt class="mt-listing-detailed-title"><a class="internal" href="https://help.oclc.org/Metadata_Services/OCLC_MARC_records/Reference" rel="internal"><span class="mt-icon-article-topic-guide"></span>Reference</a></dt><dd class="mt-listing-detailed-image mt-hide-image"><a class="internal" href="https://help.oclc.org/Metadata_Services/OCLC_MARC_records/Reference" rel="internal"><span class="mt-sortable-listing-image mt-image-placeholder"><span>No image available</span></span></a></dd><dd class="mt-listing-detailed-overview">Find additional resources for OCLC-MARC records.</dd><dd class="mt-listing-detailed-subpages"><ul class="mt-listings-simple mt-listing-article-list mt-topic-hierarchy-listings mt-guide-listings"><li class="mt-show-more-listing"><a title="Export specifications" class="mt-listing-detailed-subpage-title internal" href="https://help.oclc.org/Metadata_Services/OCLC_MARC_records/Reference/Export_specifications" rel="internal"><span class="mt-icon-article-topic"></span>Export specifications</a></li></ul></dd></dl></li><li class="mt-sortable-listing mt-sortable-listing-detailed " data-page-id="8486"><dl class="mt-listing-detailed mt-edit-section"><dt class="mt-listing-detailed-title"><a class="internal" href="https://help.oclc.org/Metadata_Services/OCLC_MARC_records/Summary_of_processing_changes" rel="internal"><span class="mt-icon-article-topic-guide"></span>Summary of processing changes</a></dt><dd class="mt-listing-detailed-image mt-hide-image"><a class="internal" href="https://help.oclc.org/Metadata_Services/OCLC_MARC_records/Summary_of_processing_changes" rel="internal"><span class="mt-sortable-listing-image mt-image-placeholder"><span>No image available</span></span></a></dd><dd class="mt-listing-detailed-overview">Learn about the history of the 049 field, the communication format, and the OCLC number.</dd><dd class="mt-listing-detailed-subpages"><ul class="mt-listings-simple mt-listing-article-list mt-topic-hierarchy-listings mt-guide-listings"><li class="mt-show-more-listing"><a title="History of field 049" class="mt-listing-detailed-subpage-title internal" href="https://help.oclc.org/Metadata_Services/OCLC_MARC_records/Summary_of_processing_changes/History_of_field_049" rel="internal"><span class="mt-icon-article-topic"></span>History of field 049</a></li><li class="mt-show-more-listing"><a title="History of the communication format" class="mt-listing-detailed-subpage-title internal" href="https://help.oclc.org/Metadata_Services/OCLC_MARC_records/Summary_of_processing_changes/History_of_the_communication_format" rel="internal"><span class="mt-icon-article-topic"></span>History of the communication format</a></li><li class="mt-show-more-listing"><a title="History of the OCLC number" class="mt-listing-detailed-subpage-title internal" href="https://help.oclc.org/Metadata_Services/OCLC_MARC_records/Summary_of_processing_changes/History_of_the_OCLC_number" rel="internal"><span class="mt-icon-article-topic"></span>History of the OCLC number</a></li></ul></dd></dl></li></ul><script type="application/json" id="mt-localizations-ordered-subpages">/*<![CDATA[*/{"MindTouch.IDF3.label.drag-n-drop":"Drag","MindTouch.IDF3.label.reveal.showAll":"Show all","MindTouch.IDF3.label.reveal.showLess":"Show 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