introduced 'simple' and 'complex values

Author: howcom

css3-values/Overview.src.html

@@ -121,11 +121,13 @@ <h2 id="values">Values</h2>
 
 
 <p>Most properties accept values from several of the above types. Some
-properties accept space- or comma-separated lists of values.
-Comma-separated lists have optional whitespace before and after the
-comma.</p>
+properties accept space- or comma-separated lists of values. A value
+that is composed of several values with spaces or commas between them,
+is called a <dfn>complex value</dfn>. A value that is not a complex
+value is a <dfn>simple value</dfn>.
 
-<p class=issue>The syntax module should perhaps describe comma- and space-separated lists?</p>
+<p>Comma-separated lists have optional whitespace before and after the
+comma.</p>
 
 <p>Each CSS property has a formal definition of what types of values
 it accepts which can be found in the description of the property. The