HTTP as a Transport Protocol
XML is just a document format. Documents by themselves don't do anything—they simply are. They contain information, but they neither read nor write that information. They tend to stay in one place, and do not move unless somebody or something moves them.
If two systems want to exchange messages in an XML format, it is not hard for them to do so. Each message can be encoded as a complete XML document. The sender can transmit the document to the receiver using FTP, HTTP, NFS, named pipes, RPC, floppy disks, a null-modem cable running between the serial ports of two machines, modems communicating over telephone lines, or any other means of moving data between systems. It's even acceptable for the sender to print the ...
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