Added 'Play' to the proposal

Following proposals in issue (#1816)

Author: Richard Wallis

data/ext/bib/bsdo-1.0.rdfa

@@ -98,6 +98,13 @@
 	<span> Subclass of:<a property="rdfs:subClassOf" href="http://schema.org/CreativeWork">schema:CreativeWork</a></span>
 </div>
 
+<div typeof="rdfs:Class" resource="http://schema.org/Play">
+	<link property="http://schema.org/isPartOf" href="http://bib.schema.org" />
+	<span class="h" property="rdfs:label">Play</span>
+	<span property="rdfs:comment">A play is a form of literature, usually consisting of dialogue between characters, intended for theatrical performance rather than just reading. Note the peformance of a Play would be a [[TheaterEvent]] - the Play being the [[workPerformed]].</span>
+	<span> Subclass of:<a property="rdfs:subClassOf" href="http://schema.org/CreativeWork">schema:CreativeWork</a></span>
+</div>
+
 <div typeof="rdfs:Class" resource="http://schema.org/SheetMusic">
 	<link property="http://schema.org/isPartOf" href="http://bib.schema.org" />
 	<span class="h" property="rdfs:label">SheetMusic</span>