The usage of file-based installation instructions is quite similar to the described approach for external documents. The FileBasedInstruction defines a pointer to the file packaged together with the VEC-file in the container and is referenced by the PartOccurrence.
The same effect could be achieved if a DocumentBasedInstruction is used, pointing to an external document (defined as described in the section before).
Important: The difference between the two approaches is that for the DocumentBasedInstruction a DocumentVersion is required. This means that the external file must be an official document with a document number, an appropriate versioning and so on. The FileBasedInstruction can point to any file needed. It is not a valid approach to use the FileBasedInstruction, if the external file is a valid document.