diff --git a/img/data_diagram.png b/img/data_diagram.png
index 85e01df..8c6a2a6 100644
Binary files a/img/data_diagram.png and b/img/data_diagram.png differ
diff --git a/img/data_diagram.svg b/img/data_diagram.svg
index 02966ff..3d76df0 100644
--- a/img/data_diagram.svg
+++ b/img/data_diagram.svg
@@ -1,2 +1,3 @@
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font-size: 11px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; vertical-align: top; white-space: nowrap; text-align: center;"><div xmlns="http://www.w3.org/1999/xhtml" style="display:inline-block;text-align:inherit;text-decoration:inherit;background-color:#ffffff;">Extends</div></div></foreignObject><text x="20" y="11" fill="#000000" text-anchor="middle" font-size="11px" font-family="Helvetica">Extends</text></switch></g><rect x="1041" y="196" width="230" height="25" fill="#ffffff" stroke="#000000" pointer-events="none"/><path d="M 1041 221 L 1041 196 L 1271 196 L 1271 221 Z" fill="#ffffff" stroke="#000000" stroke-miterlimit="10" pointer-events="none"/><g transform="translate(1137.5,202.5)"><switch><foreignObject style="overflow:visible;" pointer-events="all" width="32" height="12" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; vertical-align: top; white-space: nowrap; font-weight: bold; text-align: center;"><div xmlns="http://www.w3.org/1999/xhtml" style="display:inline-block;text-align:inherit;text-decoration:inherit;">Triple</div></div></foreignObject><text x="16" y="12" fill="#000000" text-anchor="middle" font-size="12px" font-family="Helvetica" font-weight="bold">Triple</text></switch></g><g transform="translate(1046.5,227.5)"><switch><foreignObject style="overflow:visible;" pointer-events="all" width="1" height="1" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; vertical-align: top; overflow: hidden; max-height: 0px; max-width: 218px; width: 1px; white-space: normal; word-wrap: normal;"><div xmlns="http://www.w3.org/1999/xhtml" style="display:inline-block;text-align:inherit;text-decoration:inherit;"><div><br /></div></div></div></foreignObject><text x="0" y="6" fill="#000000" text-anchor="middle" font-size="12px" font-family="Helvetica">&lt;div&gt;&lt;br&gt;&lt;/div&gt;</text></switch></g><rect x="1041" y="1" width="230" height="150" fill="#ffffff" stroke="#000000" pointer-events="none"/><path d="M 1041 27 L 1041 1 L 1271 1 L 1271 27 Z" fill="#ffffff" stroke="#000000" stroke-miterlimit="10" pointer-events="none"/><g transform="translate(1138.5,7.5)"><switch><foreignObject style="overflow:visible;" pointer-events="all" width="31" height="12" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; vertical-align: top; white-space: nowrap; font-weight: bold; text-align: center;"><div xmlns="http://www.w3.org/1999/xhtml" style="display:inline-block;text-align:inherit;text-decoration:inherit;">Quad</div></div></foreignObject><text x="16" y="12" fill="#000000" text-anchor="middle" font-size="12px" font-family="Helvetica" font-weight="bold">Quad</text></switch></g><g transform="translate(1046.5,33.5)"><switch><foreignObject style="overflow:visible;" pointer-events="all" width="83" height="54" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; vertical-align: top; overflow: hidden; max-height: 70px; max-width: 218px; width: 84px; white-space: normal; word-wrap: normal;"><div xmlns="http://www.w3.org/1999/xhtml" style="display:inline-block;text-align:inherit;text-decoration:inherit;">subject: Term<div>predicate: Term</div><div>object: Term</div><div>graph: Term</div></div></div></foreignObject><text x="42" y="33" fill="#000000" text-anchor="middle" font-size="12px" font-family="Helvetica">[Not supported by viewer]</text></switch></g><path d="M 1041 105 L 1271 105" fill="none" stroke="#000000" stroke-miterlimit="10" pointer-events="none"/><g transform="translate(1046.5,115.5)"><switch><foreignObject style="overflow:visible;" pointer-events="all" width="159" height="26" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: inline-block; 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font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; vertical-align: top; white-space: nowrap;"><div xmlns="http://www.w3.org/1999/xhtml" style="display:inline-block;text-align:inherit;text-decoration:inherit;background-color:#ffffff;">4</div></div></foreignObject><text x="3" y="11" fill="#000000" text-anchor="middle" font-size="11px" font-family="Helvetica">4</text></switch></g><rect x="1036" y="443" width="230" height="121" fill="#ffffff" stroke="#000000" pointer-events="none"/><path d="M 1036 469 L 1036 443 L 1266 443 L 1266 469 Z" fill="#ffffff" stroke="#000000" stroke-miterlimit="10" pointer-events="none"/><g transform="translate(1110.5,449.5)"><switch><foreignObject style="overflow:visible;" pointer-events="all" width="76" height="12" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; vertical-align: top; white-space: nowrap; font-weight: bold; text-align: center;"><div xmlns="http://www.w3.org/1999/xhtml" style="display:inline-block;text-align:inherit;text-decoration:inherit;">DefaultGraph</div></div></foreignObject><text x="38" y="12" fill="#000000" text-anchor="middle" font-size="12px" font-family="Helvetica" font-weight="bold">DefaultGraph</text></switch></g><g transform="translate(1041.5,475.5)"><switch><foreignObject style="overflow:visible;" pointer-events="all" width="182" height="26" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; vertical-align: top; overflow: hidden; max-height: 40px; max-width: 218px; width: 183px; white-space: normal; word-wrap: normal;"><div xmlns="http://www.w3.org/1999/xhtml" style="display:inline-block;text-align:inherit;text-decoration:inherit;">termType: String = "DefaultGraph"<div>value: String = ""</div></div></div></foreignObject><text x="91" y="19" fill="#000000" text-anchor="middle" font-size="12px" font-family="Helvetica">termType: String = "DefaultGraph"&lt;div&gt;value: String = ""&lt;/div&gt;</text></switch></g><path d="M 1036 517 L 1266 517" fill="none" stroke="#000000" stroke-miterlimit="10" pointer-events="none"/><g transform="translate(1041.5,527.5)"><switch><foreignObject style="overflow:visible;" pointer-events="all" width="157" height="26" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: inline-block; 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font-size: 11px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; vertical-align: top; white-space: nowrap; text-align: center;"><div xmlns="http://www.w3.org/1999/xhtml" style="display:inline-block;text-align:inherit;text-decoration:inherit;background-color:#ffffff;">Extends</div></div></foreignObject><text x="20" y="11" fill="#000000" text-anchor="middle" font-size="11px" font-family="Helvetica">Extends</text></switch></g><rect x="0" y="2" width="400" height="180" fill="#ffffff" stroke="#000000" pointer-events="none"/><path d="M 0 28 L 0 2 L 400 2 L 400 28 Z" fill="#ffffff" stroke="#000000" stroke-miterlimit="10" pointer-events="none"/><g transform="translate(163.5,8.5)"><switch><foreignObject style="overflow:visible;" pointer-events="all" width="69" height="12" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; 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font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; vertical-align: top; white-space: nowrap; font-weight: bold; text-align: center;"><div xmlns="http://www.w3.org/1999/xhtml" style="display:inline-block;text-align:inherit;text-decoration:inherit;">Term</div></div></foreignObject><text x="18" y="12" fill="#000000" text-anchor="middle" font-size="12px" font-family="Helvetica" font-weight="bold">Term</text></switch></g><g transform="translate(555.5,36.5)"><switch><foreignObject style="overflow:visible;" pointer-events="all" width="106" height="27" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; vertical-align: top; overflow: hidden; max-height: 40px; max-width: 218px; width: 107px; white-space: normal; overflow-wrap: normal;"><div xmlns="http://www.w3.org/1999/xhtml" style="display:inline-block;text-align:inherit;text-decoration:inherit;">termType: String<div>value: String</div></div></div></foreignObject><text x="53" y="20" fill="#000000" text-anchor="middle" font-size="12px" font-family="Helvetica">termType: String&lt;div&gt;value: String&lt;/div&gt;</text></switch></g><path d="M 550 78 L 780 78" fill="none" stroke="#000000" stroke-miterlimit="10" pointer-events="none"/><g transform="translate(555.5,88.5)"><switch><foreignObject style="overflow:visible;" pointer-events="all" width="182" height="12" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: inline-block; 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font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; vertical-align: top; white-space: nowrap; font-weight: bold; text-align: center;"><div xmlns="http://www.w3.org/1999/xhtml" style="display:inline-block;text-align:inherit;text-decoration:inherit;">NamedNode</div></div></foreignObject><text x="42" y="12" fill="#000000" text-anchor="middle" font-size="12px" font-family="Helvetica" font-weight="bold">NamedNode</text></switch></g><g transform="translate(5.5,478.5)"><switch><foreignObject style="overflow:visible;" pointer-events="all" width="213" height="27" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; vertical-align: top; overflow: hidden; max-height: 40px; max-width: 218px; width: 214px; white-space: normal; overflow-wrap: normal;"><div xmlns="http://www.w3.org/1999/xhtml" style="display:inline-block;text-align:inherit;text-decoration:inherit;">termType: String = "NamedNode"<div>value: String</div></div></div></foreignObject><text x="107" y="20" fill="#000000" text-anchor="middle" font-size="12px" font-family="Helvetica">termType: String = "NamedNode"&lt;div&gt;value: String&lt;/div&gt;</text></switch></g><path d="M 0 519.5 L 230 519.5" fill="none" stroke="#000000" stroke-miterlimit="10" pointer-events="none"/><g transform="translate(5.5,530.5)"><switch><foreignObject style="overflow:visible;" pointer-events="all" width="182" height="27" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: inline-block; 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font-size: 11px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; vertical-align: top; white-space: nowrap; text-align: center;"><div xmlns="http://www.w3.org/1999/xhtml" style="display:inline-block;text-align:inherit;text-decoration:inherit;background-color:#ffffff;">Extends</div></div></foreignObject><text x="23" y="11" fill="#000000" text-anchor="middle" font-size="11px" font-family="Helvetica">Extends</text></switch></g><path d="M 267 473 L 267 447 L 497 447 L 497 473" fill="#ffffff" stroke="#000000" stroke-miterlimit="10" pointer-events="none"/><path d="M 267 473 L 267 567 L 497 567 L 497 473" fill="#ffffff" stroke="#000000" stroke-miterlimit="10" pointer-events="none"/><path d="M 267 473 L 497 473" fill="none" stroke="#000000" stroke-miterlimit="10" pointer-events="none"/><g transform="translate(343.5,453.5)"><switch><foreignObject style="overflow:visible;" pointer-events="all" width="75" height="12" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; vertical-align: top; white-space: nowrap; font-weight: bold; text-align: center;"><div xmlns="http://www.w3.org/1999/xhtml" style="display:inline-block;text-align:inherit;text-decoration:inherit;">BlankNode</div></div></foreignObject><text x="38" y="12" fill="#000000" text-anchor="middle" font-size="12px" font-family="Helvetica" font-weight="bold">BlankNode</text></switch></g><g transform="translate(272.5,479.5)"><switch><foreignObject style="overflow:visible;" pointer-events="all" width="204" height="27" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; vertical-align: top; overflow: hidden; max-height: 40px; max-width: 218px; width: 205px; white-space: normal; overflow-wrap: normal;"><div xmlns="http://www.w3.org/1999/xhtml" style="display:inline-block;text-align:inherit;text-decoration:inherit;">termType: String = "BlankNode"<div>value: String</div></div></div></foreignObject><text x="102" y="20" fill="#000000" text-anchor="middle" font-size="12px" font-family="Helvetica">termType: String = "BlankNode"&lt;div&gt;value: String&lt;/div&gt;</text></switch></g><path d="M 267 521 L 497 521" fill="none" stroke="#000000" stroke-miterlimit="10" pointer-events="none"/><g transform="translate(272.5,531.5)"><switch><foreignObject style="overflow:visible;" pointer-events="all" width="182" height="27" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; vertical-align: top; overflow: hidden; max-height: 38px; max-width: 218px; width: 183px; white-space: normal; overflow-wrap: normal;"><div xmlns="http://www.w3.org/1999/xhtml" style="display:inline-block;text-align:inherit;text-decoration:inherit;">equals( <span>other:</span>Term ): boolean<div><br /></div></div></div></foreignObject><text x="91" y="20" fill="#000000" text-anchor="middle" font-size="12px" font-family="Helvetica">equals( &lt;span&gt;other:&lt;/span&gt;Term ): boolean&lt;div&gt;&lt;br&gt;&lt;/div&gt;</text></switch></g><path d="M 533 470 L 533 444 L 763 444 L 763 470" fill="#ffffff" stroke="#000000" stroke-miterlimit="10" pointer-events="none"/><path d="M 533 470 L 533 594 L 763 594 L 763 470" fill="#ffffff" stroke="#000000" stroke-miterlimit="10" pointer-events="none"/><path d="M 533 470 L 763 470" fill="none" stroke="#000000" stroke-miterlimit="10" pointer-events="none"/><g transform="translate(623.5,450.5)"><switch><foreignObject style="overflow:visible;" pointer-events="all" width="46" height="12" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; vertical-align: top; white-space: nowrap; font-weight: bold; text-align: center;"><div xmlns="http://www.w3.org/1999/xhtml" style="display:inline-block;text-align:inherit;text-decoration:inherit;">Literal</div></div></foreignObject><text x="23" y="12" fill="#000000" text-anchor="middle" font-size="12px" font-family="Helvetica" font-weight="bold">Literal</text></switch></g><g transform="translate(538.5,476.5)"><switch><foreignObject style="overflow:visible;" pointer-events="all" width="177" height="56" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; vertical-align: top; overflow: hidden; max-height: 70px; max-width: 218px; width: 178px; white-space: normal; overflow-wrap: normal;"><div xmlns="http://www.w3.org/1999/xhtml" style="display:inline-block;text-align:inherit;text-decoration:inherit;">termType: String = "Literal"<div>value: String</div><div>language: BCP47 String</div><div>datatype: NamedNode</div></div></div></foreignObject><text x="89" y="34" fill="#000000" text-anchor="middle" font-size="12px" font-family="Helvetica">[Not supported by viewer]</text></switch></g><path d="M 533 548 L 763 548" fill="none" stroke="#000000" stroke-miterlimit="10" pointer-events="none"/><g transform="translate(538.5,558.5)"><switch><foreignObject style="overflow:visible;" pointer-events="all" width="182" height="27" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; vertical-align: top; overflow: hidden; max-height: 38px; max-width: 218px; width: 183px; white-space: normal; overflow-wrap: normal;"><div xmlns="http://www.w3.org/1999/xhtml" style="display:inline-block;text-align:inherit;text-decoration:inherit;">equals( <span>other:</span>Term ): boolean<div><br /></div></div></div></foreignObject><text x="91" y="20" fill="#000000" text-anchor="middle" font-size="12px" font-family="Helvetica">equals( &lt;span&gt;other:&lt;/span&gt;Term ): boolean&lt;div&gt;&lt;br&gt;&lt;/div&gt;</text></switch></g><path d="M 382.67 446.67 L 609.98 138.58" fill="none" stroke="#000000" stroke-miterlimit="10" pointer-events="none"/><path d="M 620.07 124.9 L 616.81 143.63 L 603.14 133.53 Z" fill="none" stroke="#000000" stroke-miterlimit="10" pointer-events="none"/><g transform="translate(478.5,279.5)"><switch><foreignObject style="overflow:visible;" pointer-events="all" width="45" height="11" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: inline-block; 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font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; vertical-align: top; white-space: nowrap; font-weight: bold; text-align: center;"><div xmlns="http://www.w3.org/1999/xhtml" style="display:inline-block;text-align:inherit;text-decoration:inherit;">DefaultGraph</div></div></foreignObject><text x="46" y="12" fill="#000000" text-anchor="middle" font-size="12px" font-family="Helvetica" font-weight="bold">DefaultGraph</text></switch></g><g transform="translate(1071.5,475.5)"><switch><foreignObject style="overflow:visible;" pointer-events="all" width="218" height="40" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; vertical-align: top; overflow: hidden; max-height: 40px; max-width: 218px; width: 218px; white-space: normal; overflow-wrap: normal;"><div xmlns="http://www.w3.org/1999/xhtml" style="display:inline-block;text-align:inherit;text-decoration:inherit;">termType: String = "DefaultGraph"<div>value: String = ""</div></div></div></foreignObject><text x="109" y="26" fill="#000000" text-anchor="middle" font-size="12px" font-family="Helvetica">termType: String = "DefaultGraph"&lt;div&gt;value: String = ""&lt;/div&gt;</text></switch></g><path d="M 1066 517 L 1296 517" fill="none" stroke="#000000" stroke-miterlimit="10" pointer-events="none"/><g transform="translate(1071.5,527.5)"><switch><foreignObject style="overflow:visible;" pointer-events="all" width="182" height="27" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: inline-block; 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\ No newline at end of file
diff --git a/index.html b/index.html
index 441f90f..cd4d263 100644
--- a/index.html
+++ b/index.html
@@ -92,7 +92,7 @@ <h2>Design elements and principles</h2>
 
   <ul>
     <li>
-      We define data interfaces to represent <strong>triples</strong>, <strong>quads</strong>,
+      We define data interfaces to represent <strong>quads</strong>,
       <strong>named nodes</strong>, <strong>blank nodes</strong>, <strong>literals</strong> and
       <strong>variables</strong>.
     </li>
@@ -288,20 +288,6 @@ <h3><dfn>DefaultGraph</dfn> interface</h3>
     </p>
   </section>
 
-  <section data-dfn-for="Triple">
-    <h3><dfn>Triple</dfn> interface</h3>
-
-    <pre class="idl">
-    interface Triple {};
-
-    Triple implements Quad;
-    </pre>
-
-    <p>
-      Triple is an alias of Quad.
-    </p>
-  </section>
-
   <section data-dfn-for="Quad">
     <h3><dfn>Quad</dfn> interface</h3>
 
@@ -331,6 +317,9 @@ <h3><dfn>Quad</dfn> interface</h3>
       <dfn>graph</dfn> the named graph, which is a <code>DefaultGraph</code>,
       <code>NamedNode</code>, <code>BlankNode</code> or <code>Variable</code>.
     </p>
+    <p class="note">
+      <code>Triple</code> MUST be represented as <code>Quad</code> with <code>graph</code> set to a <code>DefaultGraph</code>
+    </p>
     <p>
       <dfn>equals()</dfn> returns <code>true</code> if and only if the argument is a) of the same
       type b) has all components equal.
@@ -347,8 +336,7 @@ <h3><dfn>DataFactory</dfn> interface</h3>
       Literal literal(string value, optional (string or NamedNode) languageOrDatatype);
       Variable variable(string value);
       DefaultGraph defaultGraph();
-      Quad triple(Term subject, Term predicate, Term object);
-      Quad quad(Term subject, Term predicate, Term object, optional Term graph);
+      Quad quad(Term subject, Term predicate, Term object, optional Term? graph);
     };
     </pre>
 
@@ -376,12 +364,10 @@ <h3><dfn>DataFactory</dfn> interface</h3>
     <p>
       <dfn>defaultGraph()</dfn> returns an instance of <code>DefaultGraph</code>.
     </p>
-    <p>
-      <dfn>triple()</dfn> returns a new instance of <code>Quad</code> with <code>graph</code> set to
-      <code>DefaultGraph</code>.
-    </p>
     <p>
       <dfn>quad()</dfn>returns a new instance of <code>Quad</code>.
+      If <code>graph</code> is <code>undefined</code> or <code>null</code>
+      it MUST set <code>graph</code> to a <code>DefaultGraph</code>.
     </p>
   </section>
 </section>