Firstly when a message come in any format like in well formated xml or flat file with the help of any adapter protocol like SFTP, File etc. in receive port and if message format is flat file then we need to a receive pipeline to convert it in xml because biztalk only comunicate message in xml.
At this stage xml message is not insert in biztalk message box database because its need at least one subscriber but still only message is publish at receive port and when we create a send port with route a message with filter condition of bts message context property or create a orchestration then create first active receive shape for receive port and then logical subscribers send port then whole xml message insert in biztalk message box database and move message further as design orchestration business flow.
We can also create business rules separately and call it in biztalk orchestration as per our requirement then send either in xml messages or add send pipeline at send port for flat messages.
So in this way biztalk pub-sub architecture works to complete a business process.
Nice .very useful for beginners Biztalk online course Bangalore
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