Improved taxonomy by supporting tags, multiple terms allowed, and required kind of vocabulary for specific content type.

Updated node web form, to support taxonomy editing if allowed (specific support for CMS_VOCABULARY.is_tags: BOOLEAN).
Added notion of required or optional module dependencies.

modules/taxonomy/cms_term_collection.e

@@ -0,0 +1,92 @@
+note
+	description: "[
+			Collection of CMS terms (see Taxonomy).
+		]"
+	date: "$Date$"
+	revision: "$Revision$"
+
+class
+	CMS_TERM_COLLECTION
+
+inherit
+	ITERABLE [CMS_TERM]
+
+create
+	make
+
+feature {NONE} -- Initialization
+
+	make (nb: INTEGER)
+		do
+			create items.make (nb)
+		end
+
+feature -- Access
+
+	new_cursor: INDEXABLE_ITERATION_CURSOR [CMS_TERM]
+			-- <Precursor>
+		do
+			Result := items.new_cursor
+		end
+
+	count: INTEGER
+			-- Number of terms.
+		do
+			Result := items.count
+		end
+
+feature -- Status report
+
+	is_empty: BOOLEAN
+		do
+			Result := count = 0
+		end
+
+	has (a_term: CMS_TERM): BOOLEAN
+			-- Has `a_term'?
+		do
+			Result := items.has (a_term)
+		end
+
+feature -- Element change
+
+	wipe_out
+			-- Remove all items.
+		do
+			items.wipe_out
+		ensure
+			empty: count = 0
+		end
+
+	force, extend (a_term: CMS_TERM)
+			-- Add term `a_term';
+		do
+			if not has (a_term) then
+				items.force (a_term)
+			end
+		end
+
+	remove (a_term: CMS_TERM)
+			-- Remove term `a_term'.
+		do
+			items.prune_all (a_term)
+		end
+
+	sort
+			--  Sort `items'
+		local
+			l_sorter: QUICK_SORTER [CMS_TERM]
+		do
+			create l_sorter.make (create {COMPARABLE_COMPARATOR [CMS_TERM]})
+			l_sorter.sort (items)
+		end
+
+feature {NONE} -- Implementation
+
+	items: ARRAYED_LIST [CMS_TERM]
+			-- List of terms.			
+
+;note
+	copyright: "2011-2015, Jocelyn Fiat, Javier Velilla, Eiffel Software and others"
+	license: "Eiffel Forum License v2 (see http://www.eiffel.com/licensing/forum.txt)"
+end