Source: http://wiki.vg/index.php?title=Protocol_version_numbers (Section "Versions after the Netty rewrite")
Schema:
versionName(xml) orversion_name(json): The name of the release (lowercase)versionType(xml) orversion_type(json): The type of the release (possible values:SNAPSHOT,PRE_RELEASE,RELEASEandJOKE)protocolVersion(xml) orprotocol_version(json): The protocol version used by the release
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