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PROPOSAL TO CLOSE WON'T FIX and add text to primer Basis: To properly modify information (lists/arrays/xml documents) in concurrent threads requires a level of isolation/synchronization, and CDL only provides a coarse mechanism for this - so would prefer to leave these modifications for ***silentActions***, which can then implement any necessary synchronization. We should not really be adding further activities that make this a more turing complete language. Thus silentActions can be used as a suitable silent mechanism for accessing and modifying lists and arrays and therefore we do not need explicit support in WS-CDL to do this. The primer should include an example of how this might be done using WS-CDL, silentActions and a suitable end point language.