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li.current-menu-item:hover > a, #navmenu .top-menu li:hover > a, #navmenu #dropdown li:hover > a { color:#A0B3C2; } #navmenu #dropdown li.current_page_item > a, #navmenu .top-menu li.current-menu-item > a{ color:#F7F7F7; } ul#admin li:hover{ background:#EFEFEF; box-shadow:2px 1px 3px rgba(0, 0, 0, 0.3); -moz-box-shadow:2px 1px 3px rgba(0, 0, 0, 0.3); -webkit-box-shadow:2px 1px 3px rgba(0, 0, 0, 0.3); }#dropdown li ul li, .top-menu li ul li, #dropdown li ul , .top-menu li ul{ width: 250px !important; } #dropdown li ul ul, .top-menu li ul ul{ left:250px ; } .tags { border-bottom:1px #A0B3C2 solid; border-top:1px #A0B3C2 solid; } a,h2 a:hover,h3 a:hover,#user_login,#user_pass, #sidenav a:visited { color:#597EAA; text-decoration:none; } #searchform #s { color:#E3E3E3; text-decoration:none; } a:hover { color:#114477; text-decoration:underline; } a:visited{ color:#476588; } .description { color:#A0B3C2; } #headerimg { ; float:left;margin-left:10px; } #header-logo{ float:left;margin-left:10px; padding-top:0px; padding-left:0px; } .single .blog_title a:hover { cursor:default; text-decoration:none; } .noclass{ -moz-box-shadow:none !important; box-shadow:none !important; -webkit-box-shadow: none !important; opacity:1 !important; border: none !important; }#headerimgwrap{ top:20%; } #page { width: 90%; } .narrowcolumn { float:left; margin:0; padding:25px 3% 20px 2%; width:75%; } #l_sidebar { float:left; padding:25px 1% 0 2%; width:17% }#dropdown, .top-menu{ text-align:left; }#header { background-repeat: no-repeat; background-position: center center; height: 110px; } .hleft, .hright { height: 70px; }table.statictable { font-family: verdana,arial,sans-serif; font-size:12px; color:#333333; border-width: 1px; border-color: #666666; border-collapse: collapse; } table.statictable th { border-width: 1px; padding: 8px; border-style: solid; border-left: 1em; border-right: 1em; border-color: #D2D2D2; background-color: #CACACA; } table.statictable td { border-width: 1px; padding: 8px; border-style:solid; border-left: 1em; border-right: 1em; border-color: #D2D2D2; } table.statictable tr{ background-color: #F6F6F6; } table.statictable td.special { font-weight: bold; color:grey } table.statictable td.title { font-weight: bold; letter-spacing: inherit } table.statictable .boldtext { font-weight: bold; color: #597eaa; } table.dynamictable { font-family: verdana,arial,sans-serif; font-size:12px; color:#333333; border-width: 1px; border-color: #666666; border-collapse: collapse; } table.dynamictable th { border-width: 1px; padding: 8px; border-style: solid; border-left: 1em; border-right: 1em; border-color: #D2D2D2; background-color: #FEFEFEFE; } table.dynamictable td { border-width: 1px; padding: 8px; border-style:solid; border-left: 1em; border-right: 1em; border-color: #D2D2D2; } table.dynamictable tr.even{ background-color: #ffffff; } table.dynamictable tr.odd{ background-color: #F6F6F6; } table.erratasearch { font-family: 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-webkit-box-shadow: 0 1px 2px rgba(0,0,0,.2); -moz-box-shadow: 0 1px 2px rgba(0,0,0,.2); box-shadow: 0 1px 2px rgba(0,0,0,.2); color: #505050; border: solid 1px #b7b7b7; background: #fff; background: -webkit-gradient(linear, left top, left bottom, from(#fff), to(#ededed)); background: -moz-linear-gradient(top, #fff, #ededed); filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#ffffff', endColorstr='#ededed'); } input[type="button"]:hover, .button:hover, div#infinite-handle span:hover { text-decoration: none; background: #ededed; background: -webkit-gradient(linear, left top, left bottom, from(#fff), to(#dcdcdc)); background: -moz-linear-gradient(top, #fff, #dcdcdc); filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#ffffff', endColorstr='#dcdcdc'); } input[type="button"]:active, .button:active, div#infinite-handle span: active { position: relative; top: 1px; color: #999; background: -webkit-gradient(linear, left top, left bottom, from(#ededed), to(#fff)); 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class="entryheader"><h2><a href="https://www.rfc-editor.org/bcp/bcp14.txt">BCP 14</a></h2></div><p> <b>Cite this BCP</b>: <a href="/refs/ref-bcp14.txt">TXT</a>  |</b>  <a href="https://bib.ietf.org/public/rfc/bibxml9/reference.BCP.0014.xml">XML</a> </p> <b>BCP 14 contains the following RFCs:</b><div class="scrolltable"><table class="statictable"><tr><th>Number</th><th>Files</th><th>Title</th><th>Authors</th><th>Date</th><th>More Info</th><th>Status</th></tr><tr><td><a href="https://www.rfc-editor.org/info/rfc2119"target="_blank">RFC 2119</a>, <a href="https://www.rfc-editor.org/info/bcp14"target="_blank">BCP 14</a></td><td>    </td><td><b>Key words for use in RFCs to Indicate Requirement Levels </b></td><td>S. Bradner</td><td>March 1997</td><td>Updated by <a href="https://www.rfc-editor.org/info/rfc8174"target="_blank">RFC 8174</a>, <a href="https://www.rfc-editor.org/errata/rfc2119"target="_blank">Errata</a></td><td>Best Current Practice </td></tr><tr><td><a href="https://www.rfc-editor.org/info/rfc8174"target="_blank">RFC 8174</a>, <a href="https://www.rfc-editor.org/info/bcp14"target="_blank">BCP 14</a></td><td>    </td><td><b>Ambiguity of Uppercase vs Lowercase in RFC 2119 Key Words</b></td><td>B. Leiba</td><td>May 2017</td><td>Updates <a href="https://www.rfc-editor.org/info/rfc2119"target="_blank">RFC 2119</a>, <a href="https://www.rfc-editor.org/errata/rfc8174"target="_blank">Errata</a></td><td>Best Current Practice </td></tr></table></div><hr/><h2>Abstract of RFC 2119</h2> <p> In many standards track documents several words are used to signify the requirements in the specification. These words are often capitalized. This document defines these words as they should be interpreted in IETF documents. This document specifies an Internet Best Current Practices for the Internet Community, and requests discussion and suggestions for improvements. </p><h2>Abstract of RFC 8174</h2> <p>RFC 2119 specifies common key words that may be used in protocol specifications. This document aims to reduce the ambiguity by clarifying that only UPPERCASE usage of the key words have the defined special meanings.</p> <hr> <p> For the definition of <b>Status</b>, see <a href="/info/rfc2026">RFC 2026</a>. </p><p> For the definition of <b>Stream</b>, see <a href="/info/rfc8729">RFC 8729</a>. </p> <hr> </div> </div> </div> <br><br><div id="footer"> <div id="footerdivs"> </div> <div style="clear:both"></div> <p class="credit"> <a href="//www.iab.org/">IAB</a> • <a href="//www.iana.org/">IANA</a> • <a href="//www.ietf.org">IETF</a> • <a href="//www.irtf.org">IRTF</a> • <a href="/about/independent">ISE</a> • <a href="//www.internetsociety.org">ISOC</a> • <a href="//trustee.ietf.org/">IETF Trust</a> <br> <a href="/report-summary">Reports</a> • <a href="//www.ietf.org/privacy-statement/">Privacy Statement</a> • <a href="/sitemap">Site Map</a> • <a href="/contact">Contact Us</a> </p> </div> </div> <button type="button" aria-controls="rmp-container-2538" aria-label="Menu Trigger" id="rmp_menu_trigger-2538" class="rmp_menu_trigger rmp-menu-trigger-boring"> <span class="rmp-trigger-box"> <span class="responsive-menu-pro-inner"></span> </span> </button> <div id="rmp-container-2538" class="rmp-container rmp-container rmp-slide-left"> <div id="rmp-menu-title-2538" class="rmp-menu-title"> <a href="" target="_self" id="rmp-menu-title-link"> <span></span> </a> </div> <div id="rmp-menu-wrap-2538" class="rmp-menu-wrap"><ul id="rmp-menu-2538" class="rmp-menu" role="menubar" aria-label="Default Menu"><li id="rmp-menu-item-632" class=" menu-item menu-item-type-post_type menu-item-object-page rmp-menu-item rmp-menu-top-level-item" role="none"><a href = "https://www.rfc-editor.org/retrieve/" class = "rmp-menu-item-link" role = "menuitem" >Document Retrieval</a></li><li id="rmp-menu-item-633" class=" menu-item menu-item-type-custom menu-item-object-custom rmp-menu-item rmp-menu-top-level-item" role="none"><a href = "/errata.php" class = "rmp-menu-item-link" role = "menuitem" >Errata</a></li><li id="rmp-menu-item-634" class=" menu-item menu-item-type-post_type menu-item-object-page rmp-menu-item rmp-menu-top-level-item" role="none"><a href = "https://www.rfc-editor.org/faq/" class = "rmp-menu-item-link" role = "menuitem" >Frequently Asked Questions</a></li><li id="rmp-menu-item-636" class=" menu-item menu-item-type-post_type menu-item-object-page rmp-menu-item rmp-menu-top-level-item" role="none"><a href = "https://www.rfc-editor.org/rse/format-faq/" class = "rmp-menu-item-link" role = "menuitem" >Future Format FAQ</a></li><li id="rmp-menu-item-637" class=" menu-item menu-item-type-post_type menu-item-object-page rmp-menu-item rmp-menu-top-level-item" role="none"><a href = "https://www.rfc-editor.org/history/" class = "rmp-menu-item-link" role = "menuitem" >History</a></li><li id="rmp-menu-item-638" class=" menu-item menu-item-type-post_type menu-item-object-page rmp-menu-item rmp-menu-top-level-item" role="none"><a href = "https://www.rfc-editor.org/about/" class = "rmp-menu-item-link" role = "menuitem" >About Us</a></li><li id="rmp-menu-item-639" class=" menu-item menu-item-type-post_type menu-item-object-page rmp-menu-item rmp-menu-top-level-item" role="none"><a href = "https://www.rfc-editor.org/other/" class = "rmp-menu-item-link" role = "menuitem" >Other Information</a></li><li id="rmp-menu-item-640" class=" menu-item menu-item-type-post_type menu-item-object-page rmp-menu-item rmp-menu-top-level-item" role="none"><a href = "https://www.rfc-editor.org/pubprocess/" class = "rmp-menu-item-link" role = "menuitem" >Publication Process</a></li><li id="rmp-menu-item-641" class=" menu-item menu-item-type-custom menu-item-object-custom rmp-menu-item rmp-menu-top-level-item" role="none"><a href = "/current_queue.php" class = "rmp-menu-item-link" role = "menuitem" >Publication Queue</a></li><li id="rmp-menu-item-642" class=" menu-item menu-item-type-post_type menu-item-object-page rmp-menu-item rmp-menu-top-level-item" role="none"><a href = "https://www.rfc-editor.org/styleguide/" class = "rmp-menu-item-link" role = "menuitem" >Style Guide</a></li></ul></div> <div id="rmp-menu-additional-content-2538" class="rmp-menu-additional-content"> <a href="/search/rfc_search.php">Advanced Search</a> <form id="search_query_separator_id" name="search_query_separator_name" action="/search/rfc_search_detail.php" method="POST" onsubmit="return validateComboBox(this);"> <input type="text" id ="combo_box_id" name="combo_box" maxlength="20" size ="35" placeholder="number, title, keyword, or author surname"></form> </div> </div> </body> </html>