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@@ -84,15 +84,15 @@ module OpenWFE
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         def apply (workitem)
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             name = @fei.expression_name[0, 1]
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-            text = fetch_text_content(workitem)
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+            text = fetch_text_content workitem
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             method = MAP[name]
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-            result = self.send(method, text, workitem)
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+            result = self.send method, text, workitem
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             workitem.set_result(result) if result != nil
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-            reply_to_parent(workitem)
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+            reply_to_parent workitem
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         end
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         protected
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@@ -143,11 +143,13 @@ module OpenWFE
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     #
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     # Note that it's actually easier to write :
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     #
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-    #     _set :filed => "list" do
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+    #     _set :field => "list" do
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     #         reval "[ 'a', 'b', 'c' ]"
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     #     end
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     #
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-    # but it's less secure.
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+    # but it's less secure. The best way might be :
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+    #
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+    #     set :field => "list", :value => [ 'a', 'b', 'c' ]
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     #
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     class AttributeExpression < FlowExpression
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@@ -223,6 +223,8 @@ module OpenWFE
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         #
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         def self.eval_ruby_process_definition (code, safety_level=2)
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+            # TODO : insert tree check
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+
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             #puts "\nin:\n#{code}\n"
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             code, is_wrapped = wrap_code code