OpenAIRE entity identifier and PID mapping policy » History » Version 3
Claudio Atzori, 07/12/2021 02:21 PM
1 | 1 | Alessia Bardi | h1. OpenAIRE entity identifier and PID mapping policy |
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3 | (copied from https://docs.google.com/document/d/1PnvZpmhbanJu3AeOT-zdIyMKIHoGKC4_Z0UtDFDZAeM/edit#) |
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5 | 3 | Claudio Atzori | OpenAIRE assigns internal identifiers for each object it collects. |
6 | 1 | Alessia Bardi | By default, the internal identifier is generated as @sourcePrefix::md5(localId)@ where |
7 | * @sourcePrefix@ is a namespace prefix of 12 chars assigned to the data source at registration time |
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8 | * @localid@ is the identifier assigned to the object by the data source |
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10 | After years of operation, we can say that: |
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11 | * @localId@ are unstable |
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12 | * objects can disappear from sources |
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13 | * PIDs provided by sources that are not PID agencies (authoritative sources for a specific type of PID) are often wrong (e.g. pre-print with the DOI of the published version, DOIs with typos) |
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15 | Therefore, when the record is collected from an authoritative source: |
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16 | * the identity of the record is forged using the PID, like @pidTypePrefix::md5(lowercase(doi))@ |
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17 | * the PID is added in a @pid@ element of the data model. |
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19 | When the record is collected from a source which is not authoritative for any type of PID: |
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20 | * the identity of the record is forged as usual using the local identifier; |
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21 | * the PID, if available, is added as @alternateIdentifier@s |
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23 | As of November 2021, the following data sources are used as "PID authorities": |
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25 | 2 | Claudio Atzori | |_. PID Type |_. Prefix (12 chars) |_. Authority | |
26 | 1 | Alessia Bardi | | doi | @doi_________@ | Crossref, Datacite, Zenodo | |
27 | | pmc | @pmc_________@ | Europe PubMed Central, PubMed Central | |
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28 | | pmid | @pmid________@ | Europe PubMed Central, PubMed Central | |
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29 | | arXiv | @arXiv_______@ | arXiv.org e-Print Archive | |
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30 | | handle | @handle______@ | any repository | |
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32 | TODO: WHAT HAPPENS FOR RECORDS WITH BOTH pmc and pmid? pmc wins? |
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34 | OpenAIRE also perform duplicate identification (see dedicated section for details). |
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35 | All duplicates are "merged" together in a "representative record" which must be assigned to a dedicated OpenAIRE identifier (i.e. it cannot have the identifier of one of the aggregated record). |
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36 | The following strategy is applied to generate the OpenAIRE identifier of a representative record, to ensure it is as stable as possible: |
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38 | TODO |