uuid required in sign_document but only available if the object was build (SAML Message), if we parse directly it was not available. Related to #209

Author: pitbulk

lib/xml_security.rb

@@ -80,6 +80,10 @@ class Document < BaseDocument
 
     attr_accessor :uuid
 
+    def uuid
+      uuid ||= document.root.attributes['ID']
+    end
+
     #<Signature>
       #<SignedInfo>
         #<CanonicalizationMethod />