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.