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+# platforms
+
+A Go package for formatting, normalizing and matching container platforms.
+
+This package is based on the Open Containers Image Spec definition of a [platform](https://github.com/opencontainers/image-spec/blob/main/specs-go/v1/descriptor.go#L52).
+
+## Platform Specifier
+
+While the OCI platform specifications provide a tool for components to
+specify structured information, user input typically doesn't need the full
+context and much can be inferred. To solve this problem, this package introduces
+"specifiers". A specifier has the format
+`<os>|<arch>|<os>/<arch>[/<variant>]`.  The user can provide either the
+operating system or the architecture or both.
+
+An example of a common specifier is `linux/amd64`. If the host has a default
+runtime that matches this, the user can simply provide the component that
+matters. For example, if an image provides `amd64` and `arm64` support, the
+operating system, `linux` can be inferred, so they only have to provide
+`arm64` or `amd64`. Similar behavior is implemented for operating systems,
+where the architecture may be known but a runtime may support images from
+different operating systems.
+
+## Project details
+
+**platforms** is a containerd sub-project, licensed under the [Apache 2.0 license](./LICENSE).
+As a containerd sub-project, you will find the:
+ * [Project governance](https://github.com/containerd/project/blob/main/GOVERNANCE.md),
+ * [Maintainers](https://github.com/containerd/project/blob/main/MAINTAINERS),
+ * and [Contributing guidelines](https://github.com/containerd/project/blob/main/CONTRIBUTING.md)
+
+information in our [`containerd/project`](https://github.com/containerd/project) repository.
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