diff --git a/repositories/metadata/metadata.go b/repositories/metadata/metadata.go
new file mode 100644
index 0000000..0382f73
--- /dev/null
+++ b/repositories/metadata/metadata.go
@@ -0,0 +1,21 @@
+package metadata
+
+import "context"
+
+type Repository interface {
+	CreateContainer(ctx context.Context, name string) error
+	ListContainers(ctx context.Context) ([]string, error)
+	DeleteContainer(ctx context.Context, name string) error
+
+	CreateVersion(ctx context.Context, container string) (string, error)
+	ListAllVersionsByContainer(ctx context.Context, container string) ([]string, error)
+	ListPublishedVersionsByContainer(ctx context.Context, container string) ([]string, error)
+	MarkVersionPublished(ctx context.Context, container, version string) error
+
+	CreateObject(ctx context.Context, container, version, key, casKey string) error
+	ListObjects(ctx context.Context, container, version, key string) ([]string, error)
+	DeleteObject(ctx context.Context, container, version, key string) error
+	RemapObject(ctx context.Context, container, version, key, newCASKey string) error
+
+	CreateBLOB(ctx context.Context, checksum string, size uint64, mimeType string) error
+}