Document all AttrDefs, also remove duplicant NumberSpan in favor of Integer.

git-svn-id: http://htmlpurifier.org/svnroot/htmlpurifier/trunk@308 48356398-32a2-884e-a903-53898d9a118a

library/HTMLPurifier/AttrDef/TextDecoration.php

@@ -2,9 +2,18 @@
 
 require_once 'HTMLPurifier/AttrDef.php';
 
+/**
+ * Validates the value for the CSS property text-decoration
+ * @note This class could be generalized into a version that acts sort of
+ *       like Enum except you can compound the allowed values.
+ */
 class HTMLPurifier_AttrDef_TextDecoration extends HTMLPurifier_AttrDef
 {
     
+    /**
+     * Lookup table of allowed values.
+     * @protected
+     */
     var $allowed_values = array(
         'line-through' => true,
         'overline' => true,