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+Change: Different type of references
+
+We unified the `Reference_Id` end `Reference_Path` types to a combined `Reference` that contains both:
+- id based properties that can identify a node using a `storage_id` and `node_id`
+- a `path` property that can be used to represent absolute paths as well as paths relative to the id based properties.
+While this is a breaking change it allows more flexible passing of references.
+
+https://github.com/cs3org/reva/pull/1721
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