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R2: Request-Response Protocol
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Request-response (ice-payload, ice-get-package, ice-request, ice-reply), error handling
Syndicator: subscriber/subscription verification
Subscriber: multiple subscriptions and syndicators
Enhancements: ice-nop, ping, multiple protocols (HTTP, FTP), inline content
Notes:
Multiple protocols used for retrieving content. Inline content requires CDATA parsing.