Hi, I have been working on synchronization software for Google services, and I have a question about the 'published' element on GData entry elements.
My question is: can I expect the value of the 'published' element for entries on GData to never change? Or there are cases where the value of the field may change over time? If it never changes over time, do I have a guarantee that if I do make two queries, A and B, for every element that appears on query B but not on query A (in other words, it was created between query B and query A), it will have a value of 'published' higher than the value of 'published' of every element that appeared on query A? If the answer is 'it depends on the service', do you know the answer of these questions for the Google Calendar API? [end of questions] For people who want to understand exactly why I ask this, below is an overview of the problem I am trying to solve, and why I plan to use the 'published' element, if the requisites above are satisfied: On the synchronization software, I need to query for all entries that were added, deleted or modified after the last synchronization. This is easily done by storing the value of the highest 'updated' field of las synchronization and using 'update-min' query parameter. However I need to differentiate between items that were created since last synchronization and items that were modified between last synchronization. I think I could use the 'published' element to know that, if I store the highest 'published' value since last synchronization. Then I would just need to look at the 'published' elements to know which items were created after the last synchronization and which ones already existed. But this would work only if the two requisites in the beginning of my message are satisifed: 'published' should never change, and new items should never have a 'published' date lower than the items returned by queries made before the item was created. I know there are ways to work around that if the requisites are not guaranteed, I could just keep the list of all IDs that were already seen since last synchronization. But I would like to know if I really need to do this. I would need less state information be kept if I can simply trust the 'published' field for that. Regards, -- Eduardo --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Google Data Protocol" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/google-help-dataapi?hl=en -~----------~----~----~----~------~----~------~--~---
