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# Instance addons
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Instance addons represent instances of Minecraft itself, while non-instance addons
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have to be installed into an existing instance of Minecraft. An instance addon MAY have
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launch patches for each side by applying launch patches of other instance addons using
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the `patch` [flag](flags.md) or by patching the [Minecraft](./minecraft.md)
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launch configuration directly using a [launch patch object](../schema/patch.md).
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Moreover they MAY override the main jar file using the `launch` [flag](flags.md)
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or inherit the launch configuration, including main jar overrides and patches,
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from another instance addon using the the `launch` [flag](flags.md).
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The `launch` [flag](flags.md) is recursive which means, that an instance addon MAY
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inherit it's launch configuration from another addon, which
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itself inherits it. Instance addons MAY modify inherited launch configurations using a
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[launch patch object](../schema/patch.md) or override the main jar file. Inheriting a
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launch configuration with the `launch` [flag](flags.md) also includes any
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modifications to it.
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## Launch configurations
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Instance launch configurations are always based on a
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[Minecraft launch config](./minecraft.md#launch-configuration) and MAY have patches
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applied to it. Patches are done by [launch patch objects](../schema/patch.md), which
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can override the main class and include additional arguments. Moreover instance addons MAY also
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add libraries to the classpath using the `library` [install action](./install.md#library).
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When launching a Minecraft instance, AddonScript implementations SHOULD take the Minecraft
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launch configuration as specified [here](./minecraft.md#launch-configuration) of the version,
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on which the instance is based on, and then apply all patches of instance addons in the instance
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to it. Patches are applied in the order [specified below](#patch-apply-order). Patches, which
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are applied later, MAY override settings from earlier patches.
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### Patch apply order
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Patches are applied in the following order:
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1. Patches inherited from the another instance addon using the `launch` [flag](flags.md). The
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patches of that instance addon are applied according to the same order rules
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2. Patches inherited from the another instance addon using the `patch` [flag](flags.md) in the order,
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in which the addons are specified in the [relations array](../schema/manifest.md#relations)
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3. Patches done directly by the instance addon using the [patches array](../schema/manifest.md#patches)
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in the order, in which they are specified in the array.
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## Main file
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Instance addons MAY have a main jar file for each side. The main file MAY be specified for a side
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using the `launch` [flag](flags.md) or MAY be inherited from another instance addon or from
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[Minecraft](./minecraft.md) itself using the `launch` [flag](flags.md). If it is neither specified
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nor inherited, the instance doesn't have a main jar file.
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