diff --git a/plugin.go b/plugin.go
index fec7717..2db1d29 100644
--- a/plugin.go
+++ b/plugin.go
@@ -17,3 +17,10 @@ type FuncProviderFor interface {
 	// may return nil, in which case its result is simply not considered.
 	FuncMapFor (*Document) template.FuncMap
 }
+
+// Configurable is an object that can be configured according to metadata.
+type Configurable interface {
+	// Configure uses config to configure the object. It must not modify
+	// config. Keys are namespaced with a '.' and are written in kebab case.
+	Configure (config Meta) error
+}