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transmission. However, pedocs does not secure connections (e.g. SSL or SSH protocols)in the upload process at the moment.Ingest: Generate AIPAfter the metadata have been completed and/or modified, and the uploaded file has –where necessary – been converted to PDF, the SIP is transformed into a pre-stage AIP,i.e. it is saved in the pedocs file system on the DIPF servers in Berlin.In accordance with the requirements of the criteria catalogs, pedocs records receivea Uniform Resource Name (URN) allowing them to be permanently addressed andidentified. As an institution not organized in a library association, DIPF was allocated asub-namespace and is hence able to assign URNs within this namespace. Such URNsare structured in the following manner: urn:nbn:de:[four digit number]-[unique productionnumber][check digit]. 94 While the actual “object” to which the URN is assigned is therecord for the published document, this document itself can then be addressed via theURL embedded in the record, which is noted in the metadata along with the URN. ThisURL has the structure http://www.pedocs.de/volltexte/[Year]/[ID]/ and contains anidentification number which is unique within pedocs. Both the URN and the URL are thenregistered with the DNB, which is also notified should changes to the URL occur. 95Although URNs were assigned by the pedocs software from the outset, these arebeing registered with the DNB only since October 2009. Currently, newly assigned URNsare registered immediately, whereas previously assigned URNs will be registeredretrospectively. It is for this reason that the URN field is not currently visible in all records,as the field was suppressed as long as the URN was not functional. In the future, allmetadata records and the cover sheets added to the documents will contain a referenceto the URN. As outlined above, the TRAC criteria also require that existing persistentidentifiers are included in the metadata. No such field exists in the pedocs metadataschema, nor is it planned to implement one or submit previously assigned identifiers to theDNB. 96The pedocs software allows the attachment of more than file to a record; however,structural metadata to indicate, for example, in which order these files should be viewedis not added. Thus, in the previously cited record with the ID 807, it is not obvious to usersthat the file “Dokument 2.pdf” (logically) precedes “Dokument 1.pdf” and in fact containsexplanatory notes relevant to understanding the content of the main file. pedocs is awareof this problem (which also occurs in Qucosa, the other OPUS installation considered inthis work) and is working on a solution which will allow staff to determine the order inwhich files are displayed in the record. However, the problem might also simply be solvedby adding short descriptions to files where more than document is attached to a record.94 See www.persistent-identifier.de – 11.10.2009.95 See the DNB homepage (http://www.d-nb.de/netzpub/erschl_lza/np_urn.htm – 03.11.2009) for furtherinformation about URNs at the DNB and the DNB's associated strategy.96 According to Kreusch, an existing persistent identifier might be included in the field for general remarks.This field, however, will not be submitted to the DNB.35