Added visitor patterns to WSF_VALUE

Handling UTF-8 unencoding for WSF_VALUE ...
Added WSF_TABLE_VALUE to handle list[]=a&list[]=b ...

Library encoder: added UTF8 facilities

library/text/encoder/tests/test_xml_encoder.e

@@ -0,0 +1,47 @@
+note
+	description: "[
+		Eiffel tests that can be executed by testing tool.
+	]"
+	author: "EiffelStudio test wizard"
+	date: "$Date$"
+	revision: "$Revision$"
+	testing: "type/manual"
+
+class
+	TEST_XML_ENCODER
+
+inherit
+	EQA_TEST_SET
+
+feature -- Test routines
+
+	test_xml_encoded_encoder
+		note
+			testing:  "xml-encoded"
+		do
+			test_xml_encoded_encoding ({STRING_32}"il était une fois Ni & Hao (你好)")
+		end
+
+	test_xml_encoded_encoding (s: STRING_32)
+		local
+			u: STRING_32
+			e: STRING_8
+			b: XML_ENCODER
+		do
+			create b
+			e := b.encoded_string (s)
+			u := b.decoded_string (e)
+			assert ("decoded encoded string is same", u ~ s)
+		end
+
+note
+	copyright: "Copyright (c) 1984-2011, Eiffel Software and others"
+	license: "Eiffel Forum License v2 (see http://www.eiffel.com/licensing/forum.txt)"
+	source: "[
+			Eiffel Software
+			5949 Hollister Ave., Goleta, CA 93117 USA
+			Telephone 805-685-1006, Fax 805-685-6869
+			Website http://www.eiffel.com
+			Customer support http://support.eiffel.com
+		]"
+end