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[xmlblaster-devel] About persistent and history

   I try to create a persistent topic(with long life) so every user first login and receive the Message once(just once);and if the user second login again,the xmlblaster does not post the Message to this user again. 
How can I write the key and Qos? 

   And I have  Question about history,I create a persistent topic(with long life) ,I pub a message to this topic,after a while,I pub a other message to this topic again,then I use get(xa, "<key  queryType='XPATH'>//key</key>" , "<qos/>", &xmlBlasterException) method to get the messages, I get the last message only,why I can not get the message I first post? 

Thanks very much!