Syndication File Validity

A schema defining the syndication format is delivered with the Content Store. You will find this schema, called syndication.rng in the engine/schemas folder. You can use this schema to check the validity of any syndication files you create using any RNG-capable XML validator. You are recommended to do so at least during the development phase of an import project, since invalid syndication files are likely to result in errors in the imported content.

A valid syndication file is an important prerequisite for successful import, but no guarantee: some additional conditions must be satisfied, as described in Content Identifiers and References.