Added text for #1100 from https://github.com/daisy/epub-revision-a11y/wiki/ePub-3.1-Accessibility--Proposal-To-Schema.org

Not currently defining via enumeration - should it?

Author: danbri

data/ext/pending/issue-1100.rdfa

@@ -7,7 +7,10 @@
 
     <div typeof="rdf:Property" resource="http://schema.org/accessMode">
       <span class="h" property="rdfs:label">accessMode</span>
-      <span property="rdfs:comment">The human sensory perceptual system or cognitive faculty through which a person may process or perceive information.</span>
+      <span property="rdfs:comment">The human sensory perceptual system or cognitive faculty through which a person may process or perceive information.
+
+      Expected values include: auditory, tactile, textual, visual, colorDependent, chartOnVisual, chemOnVisual, diagramOnVisual, mathOnVisual, musicOnVisual, textOnVisual.
+      </span>
       <span>domainIncludes: <a property="http://schema.org/domainIncludes" href="http://schema.org/CreativeWork">CreativeWork</a></span>
       <span>rangeIncludes: <a property="http://schema.org/rangeIncludes" href="http://schema.org/Text">Text</a></span>
       <link property="http://schema.org/isPartOf" href="http://pending.schema.org" />
@@ -16,7 +19,10 @@
 
     <div typeof="rdf:Property" resource="http://schema.org/accessModeSufficient">
       <span class="h" property="rdfs:label">accessModeSufficient</span>
-      <span property="rdfs:comment">A list of single or combined accessModes that are sufficient to understand all the intellectual content of a resource.</span>
+      <span property="rdfs:comment">A list of single or combined accessModes that are sufficient to understand all the intellectual content of a resource.
+
+      Expected values include:  auditory, tactile, textual, visual.
+      </span>
       <span>domainIncludes: <a property="http://schema.org/domainIncludes" href="http://schema.org/CreativeWork">CreativeWork</a></span>
       <span>rangeIncludes: <a property="http://schema.org/rangeIncludes" href="http://schema.org/Text">Text</a></span>
       <link property="http://schema.org/isPartOf" href="http://pending.schema.org" />