Replace .signature class with z3998:signature epub:type

src/epub/css/local.css

@@ -10,7 +10,7 @@ footer{
 	text-align: right;
 }
 
-.signature{
+[epub:type~="z3998:signature"]{
 	font-variant: small-caps;
 }
 

src/epub/text/chapter-27.xhtml

@@ -15,7 +15,7 @@
 			<blockquote epub:type="z3998:letter">
 				<p>“<span epub:type="z3998:recipient">Elisaveta</span>, I want your love. Love me, dear one, love me. I forget my knowledge, I reject my doubts, I become again as simple and as humble as a communicant of a radiant kingdom, like my dear children⁠—and I only want your nearness and your kisses. Upon the earth, dear to our heart, I will pass by, in simple and joyous humility, with bare feet, like you⁠—in order that I may come to you as you come to me. Love me.</p>
 				<footer>
-					<p epub:type="z3998:valediction">“Your <span class="signature" epub:type="z3998:sender">Giorgiy</span>.”</p>
+					<p epub:type="z3998:valediction">“Your <span epub:type="z3998:signature z3998:sender">Giorgiy</span>.”</p>
 				</footer>
 			</blockquote>
 			<p>There was a slight rustle behind the door. It seemed as if the whole house were filled with the quiet children.</p>

src/epub/text/chapter-29.xhtml

@@ -27,7 +27,7 @@
 				</header>
 				<p>“<span epub:type="z3998:salutation">Dear Sir</span>, It has come to my knowledge that on the evening of the 7th of September you participated at a meeting of instructors and instructresses, which had been arranged without the necessary permit, and that you sang there with them songs of a worldly and reprehensible character. Therefore, dear sir, I beg you in the future not to permit yourself similar actions unbecoming to your schoolmaster’s vocation, and I herewith warn you that at a repetition of such behaviour you will be immediately discharged from the service.</p>
 				<footer>
-					<p class="signature" epub:type="z3998:sender">“Inspector Shabalov.”</p>
+					<p epub:type="z3998:signature z3998:sender">“Inspector Shabalov.”</p>
 				</footer>
 			</blockquote>
 			<p>On another occasion he wrote to the same instructor:</p>

src/epub/text/introduction.xhtml

@@ -31,7 +31,7 @@
 			<p>The various references to the art and ideas of the poet Trirodov and to the poet’s tardy recognition are certain to be recognized as autobiographical.</p>
 			<p>I must add that in the original this first of “Created Legend” novels is called “Drops of Blood,” a phrase which recurs several times in the course of the narrative in connection with the problem of cruelty in life.</p>
 			<footer>
-				<p class="signature">John Cournos</p>
+				<p epub:type="z3998:signature">John Cournos</p>
 				<p>February 1916</p>
 			</footer>
 		</section>