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table.tmbox-move{border:2px solid #9932cc}.mw-parser-output table.tmbox-protection{border:1px solid #c0c090}.mw-parser-output table.fmbox{clear:both;margin:0.2em 0;width:100%;border:1px solid var(--border-color-base,#a2a9b1);background-color:var(--background-color-neutral-subtle,#f8f9fa);box-sizing:border-box}.mw-parser-output table.fmbox-system{background-color:var(--background-color-neutral-subtle,#f8f9fa)}.mw-parser-output table.fmbox-warning{border:1px solid #bb7070;background-color:#ffdbdb}.mw-parser-output table.fmbox-editnotice{background-color:transparent}html body.mediawiki .mw-parser-output .mbox-small{clear:right;float:right;margin:4px 0 4px 1em;box-sizing:border-box;width:238px;font-size:88%;line-height:1.25em}html body.mediawiki .mw-parser-output .mbox-small-left{margin:4px 1em 4px 0;box-sizing:border-box;overflow:hidden;width:238px;border-collapse:collapse;font-size:88%;line-height:1.25em}</style><table class="plainlinks ombox ombox-notice" role="presentation" lang="en" dir="auto"><tbody><tr><td class="mbox-image"><span typeof="mw:File"><span><img alt="" src="//upload.wikimedia.org/wikipedia/commons/thumb/1/1d/Information_icon4.svg/40px-Information_icon4.svg.png" decoding="async" width="40" height="40" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/1/1d/Information_icon4.svg/60px-Information_icon4.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/1/1d/Information_icon4.svg/80px-Information_icon4.svg.png 2x" data-file-width="620" data-file-height="620"/></span></span></td><td class="mbox-text">This is the documentation page for a particular constraint type. See <a href="/wiki/Special:MyLanguage/Help:Property_constraints_portal" title="Special:MyLanguage/Help:Property constraints portal">Help:Property constraints portal</a> for a general overview of property constraints.</td></tr></tbody></table> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Propozycja_LnM.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/a/a6/Propozycja_LnM.svg/220px-Propozycja_LnM.svg.png" decoding="async" width="220" height="246" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/a/a6/Propozycja_LnM.svg/330px-Propozycja_LnM.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/a/a6/Propozycja_LnM.svg/440px-Propozycja_LnM.svg.png 2x" data-file-width="586" data-file-height="655"/></a><figcaption></figcaption></figure> <p><a href="/wiki/Q54554025" title="Q54554025">citation-needed constraint <small>(Q54554025)</small></a> specifies that statements for a certain property should have at least one reference. For example, this could be used on <a href="/wiki/Wikidata:WikiProject_Properties/Wikidata_properties_likely_to_be_challenged" title="Wikidata:WikiProject Properties/Wikidata properties likely to be challenged">properties likely to be challenged</a>. </p><p>It doesn’t matter what the references look like, as long as at least one reference exists. </p><p>This constraint can only be checked on the main value of a statement; if any other <a href="/wiki/Property:P4680" title="Property:P4680">constraint scope <small dir="ltr">(P4680)</small></a> is specified, an error is reported. </p> <div class="mw-heading mw-heading2 ext-discussiontools-init-section"><h2 id="Possible_actions" data-mw-thread-id="h-Possible_actions"><span data-mw-comment-start="" id="h-Possible_actions"></span>Possible actions<span data-mw-comment-end="h-Possible_actions"></span></h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Help:Property_constraints_portal/Citation_needed&action=edit&section=1" title="Edit section: Possible actions"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>There are several possible ways to address a violation of this constraint: </p> <ul><li>The most likely case is that a reference should be added. See <a href="/wiki/Special:MyLanguage/Help:Sources" title="Special:MyLanguage/Help:Sources">Help:Sources</a> for when and how to add references. For properties using this constraint, it's unlikely that the mere addition of <a href="/wiki/Property:P143" title="Property:P143">imported from Wikimedia project <small dir="ltr">(P143)</small></a> is considered sufficient.</li> <li>It’s possible that the statement is a rare, but legitimate exception to the constraint, and nothing should be done.</li></ul> <div class="mw-heading mw-heading2 ext-discussiontools-init-section"><h2 id="Parameters" data-mw-thread-id="h-Parameters"><span data-mw-comment-start="" id="h-Parameters"></span>Parameters<span data-mw-comment-end="h-Parameters"></span></h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Help:Property_constraints_portal/Citation_needed&action=edit&section=2" title="Edit section: Parameters"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>This constraint does not have any qualifier parameters. </p> <table class="navbox" dir="ltr" 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plainlinks hlist navbar-mini"><ul><li class="nv-view"><a href="/wiki/Template:Property_constraints" title="Template:Property constraints"><abbr title="View this template" style=";background: #CDDDDD; padding-left: 1em; padding-right: 1em; text-align: center; font-size: x-small;;background:none transparent;color:inherit;border:none;">v</abbr></a></li><li class="nv-talk"><a href="/w/index.php?title=Template_talk:Property_constraints&action=edit&redlink=1" class="new" title="Template talk:Property constraints (page does not exist)"><abbr title="Discuss this template" style=";background: #CDDDDD; padding-left: 1em; padding-right: 1em; text-align: center; font-size: x-small;;background:none transparent;color:inherit;border:none;">t</abbr></a></li><li class="nv-edit"><a class="external text" href="https://www.wikidata.org/w/index.php?title=Template:Property_constraints&action=edit"><abbr title="Edit this template" style=";background: #CDDDDD; padding-left: 1em; padding-right: 1em; text-align: center; font-size: x-small;;background:none transparent;color:inherit;border:none;">e</abbr></a></li></ul></div><span style="float:right;width:6em"> </span><div style="font-size:110%"><a href="/wiki/Help:Property_constraints_portal" title="Help:Property constraints portal">Help:Property constraints portal</a></div></th></tr><tr style="height:2px"><td colspan="2"></td></tr><tr><th scope="row" class="navbox-group" style="background: #CDDDDD; padding-left: 1em; padding-right: 1em; text-align: right; font-size: 11px;">Popular</th><td class="navbox-list navbox-odd hlist" style="text-align:left;border-left-width:2px;border-left-style:solid;width:100%;padding:0px;background: #EFFFFF; text-align: left/center; font-size: 12px;"><div style="padding:0em 0.25em"> <ul><li><span typeof="mw:File"><span><img src="//upload.wikimedia.org/wikipedia/commons/thumb/7/75/Pictogram_voting_number_one.svg/14px-Pictogram_voting_number_one.svg.png" decoding="async" width="14" height="14" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/7/75/Pictogram_voting_number_one.svg/21px-Pictogram_voting_number_one.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/7/75/Pictogram_voting_number_one.svg/28px-Pictogram_voting_number_one.svg.png 2x" data-file-width="249" data-file-height="249"/></span></span> <a href="/wiki/Help:Property_constraints_portal/Single_value" title="Help:Property constraints portal/Single value">single-value constraint</a></li> <li><span typeof="mw:File"><span><img src="//upload.wikimedia.org/wikipedia/commons/thumb/e/e6/Pictogram_voting_not_equal.svg/14px-Pictogram_voting_not_equal.svg.png" decoding="async" width="14" height="14" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/e/e6/Pictogram_voting_not_equal.svg/21px-Pictogram_voting_not_equal.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/e/e6/Pictogram_voting_not_equal.svg/28px-Pictogram_voting_not_equal.svg.png 2x" data-file-width="249" data-file-height="249"/></span></span> <a href="/wiki/Help:Property_constraints_portal/Unique_value" title="Help:Property constraints portal/Unique value">distinct-values constraint</a></li> <li><span typeof="mw:File"><span><img src="//upload.wikimedia.org/wikipedia/commons/thumb/d/da/Pictogram_voting_regex.svg/14px-Pictogram_voting_regex.svg.png" decoding="async" width="14" height="14" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/da/Pictogram_voting_regex.svg/21px-Pictogram_voting_regex.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/da/Pictogram_voting_regex.svg/28px-Pictogram_voting_regex.svg.png 2x" data-file-width="249" data-file-height="249"/></span></span> <a href="/wiki/Help:Property_constraints_portal/Format" title="Help:Property constraints portal/Format">format constraint</a></li> <li><span typeof="mw:File"><span><img src="//upload.wikimedia.org/wikipedia/commons/thumb/8/83/Pictogram_voting_cluster.svg/14px-Pictogram_voting_cluster.svg.png" decoding="async" width="14" height="14" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/8/83/Pictogram_voting_cluster.svg/21px-Pictogram_voting_cluster.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/8/83/Pictogram_voting_cluster.svg/28px-Pictogram_voting_cluster.svg.png 2x" data-file-width="250" data-file-height="250"/></span></span> <a href="/wiki/Help:Property_constraints_portal/Subject_class" title="Help:Property constraints portal/Subject class">subject type constraint</a></li> <li><span typeof="mw:File"><span><img src="//upload.wikimedia.org/wikipedia/commons/thumb/d/d0/Pictogram_voting_arrow.svg/14px-Pictogram_voting_arrow.svg.png" decoding="async" width="14" height="14" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/d0/Pictogram_voting_arrow.svg/21px-Pictogram_voting_arrow.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/d0/Pictogram_voting_arrow.svg/28px-Pictogram_voting_arrow.svg.png 2x" data-file-width="249" data-file-height="249"/></span></span> <a href="/wiki/Help:Property_constraints_portal/Value_class" title="Help:Property constraints portal/Value class">value-type constraint</a></li> <li><span typeof="mw:File"><span><img src="//upload.wikimedia.org/wikipedia/commons/thumb/b/be/Pictogram_reply_soft_green.svg/14px-Pictogram_reply_soft_green.svg.png" decoding="async" width="14" height="14" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/b/be/Pictogram_reply_soft_green.svg/21px-Pictogram_reply_soft_green.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/b/be/Pictogram_reply_soft_green.svg/28px-Pictogram_reply_soft_green.svg.png 2x" data-file-width="180" data-file-height="185"/></span></span> <a href="/wiki/Help:Property_constraints_portal/Property_Scope_Constraint" title="Help:Property constraints portal/Property Scope Constraint">property scope constraint</a></li></ul> </div></td></tr><tr style="height:2px"><td colspan="2"></td></tr><tr><th scope="row" class="navbox-group" style="background: #CDDDDD; padding-left: 1em; padding-right: 1em; text-align: right; font-size: 11px;">Others</th><td class="navbox-list navbox-even hlist" style="text-align:left;border-left-width:2px;border-left-style:solid;width:100%;padding:0px;background: #EFFFFF; text-align: left/center; font-size: 12px;"><div style="padding:0em 0.25em"> <ul><li><span typeof="mw:File"><span><img src="//upload.wikimedia.org/wikipedia/commons/thumb/d/df/Pictogram_voting_two_plus.svg/14px-Pictogram_voting_two_plus.svg.png" decoding="async" width="14" height="14" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/df/Pictogram_voting_two_plus.svg/21px-Pictogram_voting_two_plus.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/df/Pictogram_voting_two_plus.svg/28px-Pictogram_voting_two_plus.svg.png 2x" data-file-width="249" data-file-height="249"/></span></span> <a href="/wiki/Help:Property_constraints_portal/Multi_value" title="Help:Property constraints portal/Multi value">multi-value constraint</a></li> <li><span typeof="mw:File"><span><img src="//upload.wikimedia.org/wikipedia/commons/thumb/8/86/Pictogram_voting_commons_logo.svg/14px-Pictogram_voting_commons_logo.svg.png" decoding="async" width="14" height="14" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/8/86/Pictogram_voting_commons_logo.svg/21px-Pictogram_voting_commons_logo.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/8/86/Pictogram_voting_commons_logo.svg/28px-Pictogram_voting_commons_logo.svg.png 2x" data-file-width="249" data-file-height="249"/></span></span> <a href="/wiki/Help:Property_constraints_portal/Commons_link" title="Help:Property constraints portal/Commons link">Commons link constraint</a></li> <li><span typeof="mw:File"><span><img src="//upload.wikimedia.org/wikipedia/commons/thumb/b/be/Pictogram_reply_soft_green.svg/14px-Pictogram_reply_soft_green.svg.png" decoding="async" width="14" height="14" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/b/be/Pictogram_reply_soft_green.svg/21px-Pictogram_reply_soft_green.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/b/be/Pictogram_reply_soft_green.svg/28px-Pictogram_reply_soft_green.svg.png 2x" data-file-width="180" data-file-height="185"/></span></span> <a href="/wiki/Help:Property_constraints_portal/Qualifiers" title="Help:Property constraints portal/Qualifiers">allowed qualifiers constraint</a></li> <li><span typeof="mw:File"><span><img src="//upload.wikimedia.org/wikipedia/commons/thumb/b/b8/Pictogram_voting_unit.svg/14px-Pictogram_voting_unit.svg.png" decoding="async" width="14" height="14" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/b/b8/Pictogram_voting_unit.svg/21px-Pictogram_voting_unit.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/b/b8/Pictogram_voting_unit.svg/28px-Pictogram_voting_unit.svg.png 2x" data-file-width="249" data-file-height="249"/></span></span> <a href="/wiki/Help:Property_constraints_portal/Units" title="Help:Property constraints portal/Units">allowed units constraint</a></li> <li><span typeof="mw:File"><span><img src="//upload.wikimedia.org/wikipedia/commons/thumb/1/1e/Pictogram_voting_x.svg/14px-Pictogram_voting_x.svg.png" decoding="async" width="14" height="14" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/1/1e/Pictogram_voting_x.svg/21px-Pictogram_voting_x.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/1/1e/Pictogram_voting_x.svg/28px-Pictogram_voting_x.svg.png 2x" data-file-width="250" data-file-height="250"/></span></span> <a href="/wiki/Help:Property_constraints_portal/Conflicts_with" title="Help:Property constraints portal/Conflicts with">conflicts-with constraint</a></li> <li><span typeof="mw:File"><span><img src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c3/Pictogram_voting_list.svg/14px-Pictogram_voting_list.svg.png" decoding="async" width="14" height="14" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c3/Pictogram_voting_list.svg/21px-Pictogram_voting_list.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c3/Pictogram_voting_list.svg/28px-Pictogram_voting_list.svg.png 2x" data-file-width="249" data-file-height="249"/></span></span> <a href="/wiki/Help:Property_constraints_portal/Diff_within_range" title="Help:Property constraints portal/Diff within range">difference-within-range constraint</a></li> <li><span typeof="mw:File"><span><img src="//upload.wikimedia.org/wikipedia/commons/thumb/0/0d/Pictogram_voting_two_arrows_to_the_center.svg/14px-Pictogram_voting_two_arrows_to_the_center.svg.png" decoding="async" width="14" height="14" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/0/0d/Pictogram_voting_two_arrows_to_the_center.svg/21px-Pictogram_voting_two_arrows_to_the_center.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/0/0d/Pictogram_voting_two_arrows_to_the_center.svg/28px-Pictogram_voting_two_arrows_to_the_center.svg.png 2x" data-file-width="250" data-file-height="250"/></span></span> <a href="/wiki/Help:Property_constraints_portal/Inverse" title="Help:Property constraints portal/Inverse">inverse constraint</a></li> <li><span typeof="mw:File"><span><img src="//upload.wikimedia.org/wikipedia/commons/thumb/8/83/Pictogram_voting_cluster.svg/14px-Pictogram_voting_cluster.svg.png" decoding="async" width="14" height="14" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/8/83/Pictogram_voting_cluster.svg/21px-Pictogram_voting_cluster.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/8/83/Pictogram_voting_cluster.svg/28px-Pictogram_voting_cluster.svg.png 2x" data-file-width="250" data-file-height="250"/></span></span> <a href="/wiki/Help:Property_constraints_portal/Item" title="Help:Property constraints portal/Item">item-requires-statement constraint</a></li> <li><span typeof="mw:File"><span><img src="//upload.wikimedia.org/wikipedia/commons/thumb/b/be/Pictogram_reply_soft_green.svg/14px-Pictogram_reply_soft_green.svg.png" decoding="async" width="14" height="14" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/b/be/Pictogram_reply_soft_green.svg/21px-Pictogram_reply_soft_green.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/b/be/Pictogram_reply_soft_green.svg/28px-Pictogram_reply_soft_green.svg.png 2x" data-file-width="180" data-file-height="185"/></span></span> <a href="/wiki/Help:Property_constraints_portal/Required_qualifiers" title="Help:Property constraints portal/Required qualifiers">required qualifier constraint</a></li> <li><span typeof="mw:File"><span><img src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c3/Pictogram_voting_list.svg/14px-Pictogram_voting_list.svg.png" decoding="async" width="14" height="14" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c3/Pictogram_voting_list.svg/21px-Pictogram_voting_list.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c3/Pictogram_voting_list.svg/28px-Pictogram_voting_list.svg.png 2x" data-file-width="249" data-file-height="249"/></span></span> <a href="/wiki/Help:Property_constraints_portal/One_of" title="Help:Property constraints portal/One of">one-of constraint</a></li> <li><span typeof="mw:File"><span><img src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c3/Pictogram_voting_list.svg/14px-Pictogram_voting_list.svg.png" decoding="async" width="14" height="14" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c3/Pictogram_voting_list.svg/21px-Pictogram_voting_list.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c3/Pictogram_voting_list.svg/28px-Pictogram_voting_list.svg.png 2x" data-file-width="249" data-file-height="249"/></span></span> <a href="/wiki/Help:Property_constraints_portal/Range" title="Help:Property constraints portal/Range">range constraint</a></li> <li><span typeof="mw:File"><span><img src="//upload.wikimedia.org/wikipedia/commons/thumb/7/74/Pictogram_voting_left_right_arrow.svg/14px-Pictogram_voting_left_right_arrow.svg.png" decoding="async" width="14" height="14" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/7/74/Pictogram_voting_left_right_arrow.svg/21px-Pictogram_voting_left_right_arrow.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/7/74/Pictogram_voting_left_right_arrow.svg/28px-Pictogram_voting_left_right_arrow.svg.png 2x" data-file-width="249" data-file-height="249"/></span></span> <a href="/wiki/Help:Property_constraints_portal/Symmetric" title="Help:Property constraints portal/Symmetric">symmetric constraint</a></li> <li><span typeof="mw:File"><span><img src="//upload.wikimedia.org/wikipedia/commons/thumb/d/d0/Pictogram_voting_arrow.svg/14px-Pictogram_voting_arrow.svg.png" decoding="async" width="14" height="14" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/d0/Pictogram_voting_arrow.svg/21px-Pictogram_voting_arrow.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/d0/Pictogram_voting_arrow.svg/28px-Pictogram_voting_arrow.svg.png 2x" data-file-width="249" data-file-height="249"/></span></span> <a href="/wiki/Help:Property_constraints_portal/Target_required_claim" title="Help:Property constraints portal/Target required claim">value-requires-statement constraint</a></li> <li><span typeof="mw:File"><span><img src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c9/Pictogram_plusminus.svg/14px-Pictogram_plusminus.svg.png" decoding="async" width="14" height="14" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c9/Pictogram_plusminus.svg/21px-Pictogram_plusminus.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c9/Pictogram_plusminus.svg/28px-Pictogram_plusminus.svg.png 2x" data-file-width="249" data-file-height="249"/></span></span> <a href="/wiki/Help:Property_constraints_portal/No_bounds" title="Help:Property constraints portal/No bounds">no-bounds constraint</a></li> <li><span typeof="mw:File"><span><img src="//upload.wikimedia.org/wikipedia/commons/thumb/7/75/Pictogram_voting_number_one.svg/14px-Pictogram_voting_number_one.svg.png" decoding="async" width="14" height="14" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/7/75/Pictogram_voting_number_one.svg/21px-Pictogram_voting_number_one.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/7/75/Pictogram_voting_number_one.svg/28px-Pictogram_voting_number_one.svg.png 2x" data-file-width="249" data-file-height="249"/></span></span> <a href="/wiki/Help:Property_constraints_portal/Integer" title="Help:Property constraints portal/Integer">integer constraint</a></li> <li><span typeof="mw:File"><span><img src="//upload.wikimedia.org/wikipedia/commons/thumb/1/1e/Pictogram_voting_x.svg/14px-Pictogram_voting_x.svg.png" decoding="async" width="14" height="14" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/1/1e/Pictogram_voting_x.svg/21px-Pictogram_voting_x.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/1/1e/Pictogram_voting_x.svg/28px-Pictogram_voting_x.svg.png 2x" data-file-width="250" data-file-height="250"/></span></span> <a href="/wiki/Help:Property_constraints_portal/None_of" title="Help:Property constraints portal/None of">none-of constraint</a></li> <li><span typeof="mw:File"><span><img src="//upload.wikimedia.org/wikipedia/commons/thumb/7/75/Pictogram_voting_number_one.svg/14px-Pictogram_voting_number_one.svg.png" decoding="async" width="14" height="14" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/7/75/Pictogram_voting_number_one.svg/21px-Pictogram_voting_number_one.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/7/75/Pictogram_voting_number_one.svg/28px-Pictogram_voting_number_one.svg.png 2x" data-file-width="249" data-file-height="249"/></span></span> <a href="/wiki/Help:Property_constraints_portal/Single_best_value" title="Help:Property constraints portal/Single best value">single-best-value constraint</a></li> <li><span typeof="mw:File"><span><img src="//upload.wikimedia.org/wikipedia/commons/thumb/a/a6/Propozycja_LnM.svg/14px-Propozycja_LnM.svg.png" decoding="async" width="14" height="16" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/a/a6/Propozycja_LnM.svg/21px-Propozycja_LnM.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/a/a6/Propozycja_LnM.svg/28px-Propozycja_LnM.svg.png 2x" data-file-width="586" data-file-height="655"/></span></span> <a class="mw-selflink selflink">citation-needed constraint</a></li> <li><span typeof="mw:File"><span><img src="//upload.wikimedia.org/wikipedia/commons/thumb/9/94/Wikidata-HS-icon.svg/14px-Wikidata-HS-icon.svg.png" decoding="async" width="14" height="14" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/9/94/Wikidata-HS-icon.svg/21px-Wikidata-HS-icon.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/9/94/Wikidata-HS-icon.svg/28px-Wikidata-HS-icon.svg.png 2x" data-file-width="156" data-file-height="156"/></span></span> <a href="/wiki/Help:Property_constraints_portal/Allowed_entity_types" title="Help:Property constraints portal/Allowed entity types">allowed-entity-types constraint</a></li> <li><span typeof="mw:File"><span><img src="//upload.wikimedia.org/wikipedia/commons/thumb/a/a1/Hourglass_icon.svg/14px-Hourglass_icon.svg.png" decoding="async" width="14" height="14" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/a/a1/Hourglass_icon.svg/21px-Hourglass_icon.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/a/a1/Hourglass_icon.svg/28px-Hourglass_icon.svg.png 2x" data-file-width="249" data-file-height="249"/></span></span> <a href="/wiki/Help:Property_constraints_portal/Contemporary" title="Help:Property constraints portal/Contemporary">contemporary constraint</a></li> <li><span typeof="mw:File"><span><img src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c3/Pictogram_voting_list.svg/14px-Pictogram_voting_list.svg.png" decoding="async" width="14" height="14" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c3/Pictogram_voting_list.svg/21px-Pictogram_voting_list.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c3/Pictogram_voting_list.svg/28px-Pictogram_voting_list.svg.png 2x" data-file-width="249" data-file-height="249"/></span></span> <a href="/wiki/Q55819078" title="Q55819078">lexeme requires lexical category constraint</a></li> <li><span typeof="mw:File"><span><img src="//upload.wikimedia.org/wikipedia/commons/thumb/5/55/Pictogram_voting_info_ku.svg/14px-Pictogram_voting_info_ku.svg.png" decoding="async" width="14" height="14" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/5/55/Pictogram_voting_info_ku.svg/21px-Pictogram_voting_info_ku.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/5/55/Pictogram_voting_info_ku.svg/28px-Pictogram_voting_info_ku.svg.png 2x" data-file-width="250" data-file-height="250"/></span></span> <a href="/wiki/Help:Property_constraints_portal/Lexeme_language" title="Help:Property constraints portal/Lexeme language">lexeme requires language constraint</a></li> <li><span typeof="mw:File"><span><img src="//upload.wikimedia.org/wikipedia/commons/thumb/d/d0/Pictogram_voting_arrow.svg/14px-Pictogram_voting_arrow.svg.png" decoding="async" width="14" height="14" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/d0/Pictogram_voting_arrow.svg/21px-Pictogram_voting_arrow.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/d0/Pictogram_voting_arrow.svg/28px-Pictogram_voting_arrow.svg.png 2x" data-file-width="249" data-file-height="249"/></span></span> <a href="/wiki/Q64006792" title="Q64006792">lexeme-value-requires-lexical-category constraint</a></li> <li><span typeof="mw:File"><span><img src="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Symbol_Translate.svg/14px-Symbol_Translate.svg.png" decoding="async" width="14" height="14" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Symbol_Translate.svg/21px-Symbol_Translate.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Symbol_Translate.svg/28px-Symbol_Translate.svg.png 2x" data-file-width="180" data-file-height="185"/></span></span> <a href="/wiki/Q108139345" title="Q108139345">label in language constraint</a></li> <li><span typeof="mw:File"><span><img src="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Symbol_Translate.svg/14px-Symbol_Translate.svg.png" decoding="async" width="14" height="14" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Symbol_Translate.svg/21px-Symbol_Translate.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Symbol_Translate.svg/28px-Symbol_Translate.svg.png 2x" data-file-width="180" data-file-height="185"/></span></span> <a href="/wiki/Q111204896" title="Q111204896">description in language constraint</a></li></ul> </div></td></tr><tr style="height:2px"><td colspan="2"></td></tr><tr><th scope="row" class="navbox-group" style="background: #CDDDDD; padding-left: 1em; padding-right: 1em; text-align: right; font-size: 11px;"><a href="/wiki/Wikidata:Database_reports/Constraint_violations" title="Wikidata:Database reports/Constraint violations">Constraint violation</a></th><td class="navbox-list navbox-odd hlist" style="text-align:left;border-left-width:2px;border-left-style:solid;width:100%;padding:0px;background: #EFFFFF; text-align: left/center; font-size: 12px;"><div style="padding:0em 0.25em"><a href="/wiki/Category:Constraint_violation_reports" title="Category:Constraint violation reports">Category:Constraint violation reports</a> (<a href="/wiki/Wikidata:Database_reports/Constraint_violations/Summary" title="Wikidata:Database reports/Constraint violations/Summary">Summary</a>)</div></td></tr><tr style="height:2px"><td colspan="2"></td></tr><tr><th scope="row" class="navbox-group" style="background: #CDDDDD; padding-left: 1em; padding-right: 1em; text-align: right; font-size: 11px;"><a href="/wiki/Template:Complex_constraint" title="Template:Complex constraint">Complex constraints</a></th><td class="navbox-list navbox-even hlist" style="text-align:left;border-left-width:2px;border-left-style:solid;width:100%;padding:0px;background: #EFFFFF; text-align: left/center; font-size: 12px;"><div style="padding:0em 0.25em"> <ul><li><a href="/wiki/Category:Complex_constraint_violation_reports" title="Category:Complex constraint violation reports">Category:Complex constraint violation reports</a> (<a href="/wiki/Wikidata:Database_reports/Complex_constraints" title="Wikidata:Database reports/Complex constraints">Overview</a>)</li> <li><a href="/wiki/Help:Property_constraints_portal/Value_label" title="Help:Property constraints portal/Value label">complex constraint value label</a></li> <li><a href="/wiki/Help:Property_constraints_portal/Recency" title="Help:Property constraints portal/Recency">complex constraint recency</a></li> <li><a href="/wiki/Help:Property_constraints_portal/Label_language" title="Help:Property constraints portal/Label language">complex constraint label language</a></li> <li><a href="/wiki/Help:Property_constraints_portal/Value_label_template" title="Help:Property constraints portal/Value label template">complex constraint value label template</a></li></ul> </div></td></tr><tr style="height:2px"><td colspan="2"></td></tr><tr><td class="navbox-abovebelow" colspan="2"><div>See also: <a href="/wiki/Wikidata:WikiProject_property_constraints" title="Wikidata:WikiProject property constraints">Wikidata:WikiProject property constraints</a> - <a href="/wiki/Wikidata:WikiProject_Properties" title="Wikidata:WikiProject Properties">Wikidata:WikiProject Properties</a> - <a href="/wiki/Wikidata:WikiProject_Ontology" title="Wikidata:WikiProject Ontology">Wikidata:WikiProject Ontology</a> - <a href="/wiki/Wikidata:WikiProject_Counter-Vandalism" title="Wikidata:WikiProject Counter-Vandalism">Wikidata:WikiProject Counter-Vandalism</a></div></td></tr></tbody></table></td></tr></tbody></table>    </div><noscript><img src="https://login.wikimedia.org/wiki/Special:CentralAutoLogin/start?type=1x1" alt="" width="1" height="1" style="border: none; position: absolute;"></noscript> <div class="printfooter" data-nosnippet="">Retrieved from "<a dir="ltr" href="https://www.wikidata.org/w/index.php?title=Help:Property_constraints_portal/Citation_needed&oldid=941030244">https://www.wikidata.org/w/index.php?title=Help:Property_constraints_portal/Citation_needed&oldid=941030244</a>"</div></div> <div id="catlinks" class="catlinks catlinks-allhidden" data-mw="interface"></div> </div> </div> <div id="mw-navigation"> <h2>Navigation menu</h2> <div id="mw-head"> <nav 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