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Also, a set of attributes is stated under "Conditional" title with less detailed information. These attributes are further divided into two classes; ones that are mandatory if e.g. publication type is article and ones that are optional for all recordswould be required based on the record's publication type. For example a book chapter should be accompanied by ISBN number of the book and the source title of this book. Otherwise, these attributes would be optional.

Last, some attributes are listed under "Optional" title. These would not be required by the validation process for any records, but would be strongly recommended in metadata exchanges to support the quality of metadata and help with e.g. de-duplication processes of the infrastructure.

Proposed European Publication Information Infrastructure Data Model's attributes

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Publication
 Internal identifier
 Publication type
 Publication title
 Publication date
 Author
  Organizational author and affiliation
 Discipline

Conditional

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 ISSN*
 ISBN*
 Source title*
 Peer review*
 Conference*
 
Mandatory based on publication type*

Optional

 Audience
 DOI
 Volume
 Number
 Start page
 End page
Mandatory based on publication type*

Mandatory attributes

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Disclaimer: The practices on how to classify discipline for publications vary heavily and many of the source systems use different variations of FoS classification or even use a local classification for disciplines. Discipline can in addition be defined by 1) publication itself, 2) journal of the publication, 3) author of the publication or 4) organizational unit where the author comes from.

Conditional attributes

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The Digital Object Identifier (DOI) of the publication.

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ISSN	CERIF representation	OpenAIRE Guidelines for CRIS Managers	European Publication Information Infrastructure
The ISSN number of the series publishing the journal, monograph or parent publication according to the primary printed version. If there is no printed version, the ISSN number of the electronic version will be indicated.	XML element ISSN	optional, possibly multiple (0..*)	mandatory (1) if publication type of following otherwise optional, possibly multiple (0..*)

ISBN	CERIF representation	OpenAIRE Guidelines for CRIS Managers	European Publication Information Infrastructure
Publication or parent publication ISBN number.	XML element ISBN	optional, possibly multiple (0..*)	mandatory (1) if publication type of following otherwise optional, possibly multiple (0..*)

Conference

Source title	CERIF representation	OpenAIRE Guidelines for CRIS Managers	European Publication Information Infrastructure
The source (another Publication) where this publication appeared. E.g. a journal article lists here the journal where it appeared. To be used for a publishing channel.	XML element PublishedIn with embedded XML element Publication	optional (0..1)	mandatory (1) if publication type of following otherwise optional (0..1)

Peer review	CERIF representation	OpenAIRE Guidelines for CRIS Managers	European Publication Information Infrastructure
Whether the publication is peer reviewed.	XML element using tags	Not present	mandatory (1) if publication type of following otherwise optional (0..1) Could also be enriched via journal/book information

Optional attributes

Supporting documents

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