Some people think the library can use students or paraprofessionals to do the job. I would say Yes and No. As you might notice, the purpose of metadata creation is to let users easily find the information they need. If a person doesn't understand the philosophy of the information retrieval, how can he/she know to create the right access for users? However, if metadata librarians can set up some procedures, teach them some of the processes, then they would be a great help to metadata librarians. For instance, if metadata librarians set up batch loading form, students or paraprofessionals will prepare the basic metadata form first, then metadata librarians can work on the form and batch load metadata into DSpace.
Therefore, there is no rules for this. Librarians should allocate tasks with the collaboration of the personnel in the libraries. The bottom line is to facilitate metadata creation for digital collections.