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In contrast to nestor and TRAC, the DINI catalog primarily focuses on descriptivemetadata, the use of subject terms and/or classification in particular (see 2.6.1Sacherschließung), in its requirements. The creation of technical metadata, formatidentification, and preservation metadata is merely recommended (see recommendations2.6.2, 2.8), a fact that highlights again that the DINI catalog is first and foremostaddressed at “traditional”, non-preservation-centered repositories. In addition, DINIrequires metadata to be structured according to Dublin Core Simple and recommends theDublin Core Qualified element set. 87All three criteria catalogs require repositories to make use of persistent identifiers(PIs) in order to make it possible to address their digital objects permanently. According tothe Paradigm Workbook, in contrast to URLs, PIs “provide a means of connecting anddistinguishing between an identifier for an object (which should be permanent) and anobject's location (which may change)” (Bodleian Library 2007, 48). As explained by theDNB, persistent identifiers serve to- permanently address a digital object,- simultaneously refer to several storage locations,- unequivocally identify a digital object as information entity worldwide, but also- reliably identify single parts of a digital object. 88All of these functions are important if not indispensable not only in the context of digitallong-term preservation, but also in the context of everyday scholarly work, which similarlydepends on the ability to permanently identify and address (referenced) digital objects in amanner that is wholly unambiguous.2.2.1 pedocs IngestIngest: Receive SubmissionDigital objects ingested into pedocs can be deposited through two channels:Depositors can upload born-digital or digitized documents through a web interface 89requiring them to enter a certain amount of (descriptive) metadata. In addition, somedocuments – especially digitized material – is uploaded into pedocs by the repository staff.According to the pedocs policy Guidelines, only PDF or PDF/A file format are accepted forpublication in the repository 90 , and hence file formats different from PDF will not beaccepted for the purpose of archiving unless an individual agreement has been madebetween the author and the repository staff. In such exceptional cases, repository staff willconvert submitted files to PDF.Both the repository's policy document and the author agreement, which wasdeveloped in cooperation with a law firm and will be publicly available soon, specify that87 This requirement is related to the fact that Dublin Core metadata can be harvested through OAI-PMH,which is particularly relevant to institutional and subject repositories.88 http://www.persistent-identifier.de/?link=203&lang=en – 11.10.2009.89 See http://www.pedocs.de/uni/index.php – 10.10.2009.90 Technically, however, upload of different file formats is possible, as these are not rejected by the repositorysoftware. Note that this might mean that the DINI requirement defined in criterion 2.5.1 is not satisfied.31