DTD Tutorial

<table width="100%"><tr><td><span class="mediumText"><b>>> English <<</b> | <a class="naviBlack" target="_top" href="../Output_cze/example12.html">česky</a> | <a class="naviBlack" target="_top" href="../Output_spa/example12.html">Español</a> | <a class="naviBlack" target="_top" href="../Output_rus/example12.html">По-русски</a> | <a class="naviBlack" target="_top" href="../Output_fre/example12.html">Français</a> | <a class="naviBlack" target="_top" href="../Output_ita/example12.html">Italiano</a> | <a class="naviBlack" target="_top" href="../Output_ger/example12.html">Deutsch</a> | <a class="naviBlack" target="_top" href="../Output_hun/example12.html">Magyar</a></span></td><td style="text-align:right"><span class="mediumText"><a class="naviBlack" target="_top" href="../../../index.html">thebigdir</a> > <a class="naviBlack" target="_top" href="../../../index12db.html?nav_id=tutorials">Tutorials</a> > <b>DTD Tutorial</b></span></td></tr></table><table class="bar" width="750px" border="0" cellpadding="0" cellspacing="0"><tr><td class="naviBlue"><a class="naviWhite" target="_top" href="../General/book.html">Intro</a> / <a class="naviWhite" target="_top" href="http://thebigdir.com/search.php">Search</a> / <a class="naviWhite" target="_top" href="../../../index.html"> home loan mortgage equity refinancing calculator lender rates</a></td></tr></table><table class="hangingMenu" border="0" cellpadding="1" cellspacing="0" width="100%"><tr><td><b>>> Example 12 <<</b> | <a class="naviBlack" href="example11.html">Prev</a> | <a class="naviBlack" href="example13.html">Next</a> | <a class="naviBlack" href="../General/contents.html">Contents</a></td></tr></table><br/><h3>Description</h3><hr/><div class="description">The value of IDREF attribute must match the value of some ID attribute in the document. The value of IDREFS attribute can contain several references to elements with ID attribute separated with whitespaces.</div><br/><h3>DTD</h3><hr/><br/><div class="docDescription">The attributes <span class="attribute">id</span> and <span class="attribute">mark</span> uniquely determine their element. The attributes <span class="attribute">ref</span> refer to these elements: </div><table width="90%" cellpadding="15"><tr><td class="doc"><br /><!ELEMENT XXX (AAA+ , BBB+, CCC+, DDD+)><br /><!ELEMENT AAA (#PCDATA)><br /><!ELEMENT BBB (#PCDATA)><br /><!ELEMENT CCC (#PCDATA)><br /><!ELEMENT DDD (#PCDATA)><br /><!ATTLIST AAA <br />      mark ID #REQUIRED><br /><!ATTLIST BBB <br />      id ID #REQUIRED>      <br /><!ATTLIST CCC <br />      ref IDREF #REQUIRED><br /><!ATTLIST DDD <br />      ref IDREFS #REQUIRED>      <br /></td></tr></table><br/><h3>Valid documents<sup><a href="#">Top</a></sup></h3><hr/><br/><div class="docDescription">All ID values are unique and all IDREF and IDREFS point to elements with relevant IDs: </div><table width="90%" cellpadding="15"><tr><td class="doc"><br /> <!DOCTYPE XXX SYSTEM "tutorial.dtd"><br/><br /><XXX><br />   <AAA mark="a1"/><br />   <AAA mark="a2"/><br />   <AAA mark="a3"/><br />   <BBB id="b001" /><br />   <CCC ref="a3" /><br />   <DDD ref="a1 b001 a2" /><br /></XXX><br /></td></tr></table><br/><h3>Documents with errors<sup><a href="#">Top</a></sup></h3><hr/><br/><div class="docDescription">There are no ID attributes with value a3 or b001: </div><table width="90%" cellpadding="15"><tr><td class="doc"><br /> <!DOCTYPE XXX SYSTEM "tutorial.dtd"><br/><br /><XXX><br />   <AAA mark="a1"/><br />   <AAA mark="a2"/>   <br />   <BBB id="b01" /><br />   <CCC ref="<span class="error">a3</span>" /><br />   <DDD ref="a1 <span class="error">b001</span> a2" /><br /></XXX><br /></td></tr></table><br/><div class="docDescription">The attribute <span class="attribute">ref</span> in element <span class="element">CCC</span> is of type IDREF. It can contain only one reference: </div><table width="90%" cellpadding="15"><tr><td class="doc"><br /> <!DOCTYPE XXX SYSTEM "tutorial.dtd"><br/><br /><XXX><br />   <AAA mark="a1"/><br />   <AAA mark="a2"/><br />   <AAA mark="a3"/><br />   <BBB id="b001" /><br />   <CCC ref="<span class="error">a1 b001 a2</span>" /><br />   <DDD ref="a1 b001 a2" /><br /></XXX><br /></td></tr></table><br/><p> </p> <p><a href="http://www.quiksilversurfcamps.com">Quiksilver Surf Camps and Surf School</a></p> <p><a href="http://www.roxysurfcamps.com">Roxy Surf Camps and Surf School</a></p> <p> </p>