Add Vertical Orientations section and vosimple.txt

Author: kojiishi

css3-writing-modes/Overview.html

@@ -240,7 +240,10 @@ <h2 class="no-num no-toc" id=Contents> Table of Contents</h2>
       Text: the ‘<code class=property>text-orientation</code>’
       property</a>
       <ul class=toc>
-       <li><a href="#vertical-font-features"><span class=secno>5.1.1. </span>
+       <li><a href="#vertical-orientations"><span class=secno>5.1.1. </span>
+        Vertical Orientations</a>
+
+       <li><a href="#vertical-font-features"><span class=secno>5.1.2. </span>
         Vertical Typesetting and Font Features</a>
       </ul>
     </ul>
@@ -1887,7 +1890,44 @@ <h3 id=text-orientation><span class=secno>5.1. </span> Orienting Text: the
    some guidance on the orientation of characters is given in <a
    href="#vertical-typesetting-details">Appendix C</a>.
 
-  <h4 id=vertical-font-features><span class=secno>5.1.1. </span> Vertical
+  <h4 id=vertical-orientations><span class=secno>5.1.1. </span> Vertical
+   Orientations</h4>
+
+  <p><a href="https://bitbucket.org/kojiishi/ucd/raw/tip/vosimple.txt">This
+   data file</a> defines two properties in UCD format <a href="#UAX44"
+   rel=biblioentry>[UAX44]<!--{{!UAX44}}--></a>:
+
+  <dl>
+   <dt><dfn id=mvosimple>MVOsimple</dfn>
+
+   <dd>This property defines character orientations for ‘<a
+    href="#mixed-right"><code class=css>mixed-right</code></a>’.
+
+   <dt><dfn id=svosimple>SVOsimple</dfn>
+
+   <dd>This property defines character orientations for ‘<a
+    href="#upright"><code class=css>upright</code></a>’.
+  </dl>
+
+  <p>The UA should render a character in upright if the value is ‘<code
+   class=css>U</code>’, or in sideways if ‘<code class=css>R</code>’.
+
+  <div class=note>These two properties are derived properties using the
+   pseudo-algorithm shown below:
+   <pre>
+      if ((HO = "L") and (VO = "U")) then
+        VOsimple := "R"
+      else if (VO in ["U", "T", "Tu", "Tr"]) then
+        VOsimple := "U"
+      else if (VO = "R") then
+        VOsimple := "R"</pre>
+
+   <p>from draft #5 of <a href="#UTR50"
+    rel=biblioentry>[UTR50]<!--{{UTR50}}--></a> with a few changes that were
+    discussed with UTC.</p>
+  </div>
+
+  <h4 id=vertical-font-features><span class=secno>5.1.2. </span> Vertical
    Typesetting and Font Features</h4>
 
   <p>When typesetting text in vertical writing modes:

css3-writing-modes/Overview.src.html

@@ -1322,6 +1322,31 @@ <h3 id="text-orientation">
     some guidance on the orientation of characters is given in
     <a href="#vertical-typesetting-details">Appendix C</a>.
 
+<h4 id=vertical-orientations>
+Vertical Orientations</h4>
+
+  <p><a href="https://bitbucket.org/kojiishi/ucd/raw/tip/vosimple.txt">This data file</a>
+    defines two properties in UCD format [[!UAX44]]:</p>
+  <dl>
+    <dt><dfn>MVOsimple</dfn></dt>
+    <dd>This property defines character orientations for ''mixed-right''.</dd>
+    <dt><dfn>SVOsimple</dfn></dt>
+    <dd>This property defines character orientations for ''upright''.</dd>
+  </dl>
+  <p>The UA should render a character in upright if the value is ''U'',
+    or in sideways if ''R''.</p>
+  <div class="note">These two properties are derived properties
+    using the pseudo-algorithm shown below:
+    <pre>
+      if ((HO = "L") and (VO = "U")) then
+        VOsimple := "R"
+      else if (VO in ["U", "T", "Tu", "Tr"]) then
+        VOsimple := "U"
+      else if (VO = "R") then
+        VOsimple := "R"</pre>
+    <p>from draft #5 of [[UTR50]] with a few changes that were discussed with UTC.</p>
+  </div>
+
 <h4 id=vertical-font-features>
 Vertical Typesetting and Font Features</h4>