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However, protocol buffers are not always a better solution than XML ¨C
for instance, protocol buffers would not be a good way to model a
text-based document with markup (e.g. HTML), since you cannot easily
interleave structure with text.

(§ï§ä§à §Ú§Ù  http://code.google.com/apis/protocolbuffers/docs/overview.html)

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