Attempt to deal with undefined terms PI, DOM, CDATA, PCDATA <http://lists.w3.org/Archives/Public/www-style/2009Mar/0148.html> issues 4 and 6

Author: fantasai

selectors3/Overview.html

@@ -1540,7 +1540,7 @@ <h4><a name=structural-pseudos>6.6.5. Structural pseudo-classes</a></h4>
 the document tree but cannot be represented by other simple selectors or
 combinators. 
 
-<p>Standalone pieces of PCDATA (text nodes in the DOM) and other non-element
+<p>Standalone text and other non-element
 nodes are not counted when calculating the position of an element in the list
 of children of its parent. When calculating the position of an element in
 the list of children of its parent, the index numbering starts at 1.
@@ -1848,11 +1848,12 @@ <h5><a name=only-of-type-pseudo>:only-of-type pseudo-class</a></h5>
 <h5><a name=empty-pseudo></a>:empty pseudo-class</h5>
 
 <p>The <code>:empty</code> pseudo-class represents an element that has
-no children at all. In terms of the DOM, only element nodes and text
-nodes (including CDATA nodes and entity references) whose data has a
-non-zero length must be considered as affecting emptiness; comments,
-PIs, and other nodes must not affect whether an element is considered
-empty or not.</p>
+no children at all. In terms of the document tree, only element nodes and
+content nodes (such as DOM <a href="refsDOM3">[DOM3]</a> text nodes, CDATA
+nodes, and entity references) whose data has a non-zero length must be
+considered as affecting emptiness;
+comments, processing instructions, and other nodes must not affect whether
+an element is considered empty or not.</p>
 
 <div class="example">
  <p>Examples:</p>
@@ -2852,6 +2853,10 @@ <h3><a name=informative-references>15.2 Informative References</a></h3>
   <dd>(<code><a href="http://www.w3.org/TR/charmod/">http://www.w3.org/TR/charmod/</a></code>)
 -->
 
+  <dt>[DOM3]
+  <dd><a name="refsDOM3"></a> Arnaud Le Hors, Philppe Le H&eacute;garet, et al., editors; "<cite>Document Object Model (DOM) Level 3 Core Specification</cite">, W3C Recomendation, 07 April 2004
+  <dd>(<a href="http://www.w3.org/TR/DOM-Level-3-Core/"><code>http://www.w3.org/TR/DOM-Level-3-Core/</code></a>)
+
   <dt>[HTML4]
   <dd><a name="refsHTML4"></a> Dave Raggett, Arnaud Le Hors, Ian Jacobs, editors; "<cite>HTML 4.01 Specification</cite>", W3C Recommendation, 24 December 1999
   <dd>(<a href="http://www.w3.org/TR/html4/"><code>http://www.w3.org/TR/html4/</code></a>)