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/URI.php

@@ -11,6 +11,10 @@ HTMLPurifier_ConfigDef::define(
     'select the proper object validator when no scheme information is present.'
 );
 
+/**
+ * Validates a URI as defined by RFC 3986.
+ * @note Scheme-specific mechanics deferred to HTMLPurifier_URIScheme
+ */
 class HTMLPurifier_AttrDef_URI extends HTMLPurifier_AttrDef
 {