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Instance addons
Instance addons represent instances of Minecraft itself, while non-instance addons
have to be installed into an existing instance of Minecraft. An instance addon requires
a launch configuration for each side for which it is available. This means, that an instance
addon must have exactly one file or relation
for each side, which has the launch flag flag. A file can not have this flag
on both sides, since the file type is different for each side, while a relation may have
it on both sides, as long as the related addon is itself an instance addon for both sides.
Instance addons as relations
If an instance addon is a relation of another instance addon, each side of that
relation requires to have at least one of the flags included, launch
or incompatible. Non-instance addons may have instance addons as relations without
this restrictions.