Weaknesses
- In-band binary data transfer is inefficient
- Because XMPP is not yet encoded as Efficient XML Interchange but as a long-lived XML stream, binary data must be first base64 encoded before it can be transmitted in-band. Therefore any significant amount of binary data (e.g., file transfers) is best transmitted out-of-band, using in-band messages to coordinate. The best example of this is the Jingle XMPP Extension Protocol, XEP-0166.
Read more about this topic: Extensible Messaging And Presence Protocol
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