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<big>NOTE : the content of this section is maintained on GitHub http://w3c.github.io/dwbp/bp.html#preservation </big> 

= Data preservation =
Data preservation is a well understood and commonly performed tasks for static and self-contained data. This commonly includes the following steps:
* Ingest the data and assign a persistent identifier to it
* Ensure the data is correctly stored and prevent bit rot
* Provide access to the data and perform format translation if needed
The model most commonly referred to is [http://en.wikipedia.org/wiki/Open_Archival_Information_System Open Archival Information System]. Many institutions taking care of digital preservation are implementing this model or some variant of it. Web pages can be preserved following the same strategies, considering a web site as a static data set that is self-contained and can be all snap-shoted and preserved at a fixed time.

When it comes to Web data some new elements have to be taken into account, namely:
* The persistent identifiers (IRI) used across the web are related to live data that can change
* The meaning of a resource is contextualized by the other resources it is linked to
* Documents fetched in HTML, RDF of JSON, for instance, are only one of the many possible serialization of the data they represent

The two following sections tackle requirements for the digital archive and the data depositors of Web data.

= Digital trusted repositories =
{{BP
| title = Maintain a list of resources
| description = Archives should maintain a list of resources being described in the preserved datasets
| why = Web data is about the description of resources identified with a IRI. It is to be expected that queries made by data consumers will resolve around finding a preserved description of a particular resource. 
| what = At ingestion time a Web data dataset dump is scanned for all the subject described. For RDF and JSON-LD, this corresponds to all the resources in the "subject" position of statements.
| outcome = A list of resources per ingested dataset
| implementation = .
| test = .
| evidence = .
}}

{{BP
| title = Assess preservation coverage
| description = Archives should assess the preservation coverage of a particular dataset prior to ingestion
| why = A chunk of Web data is by definition dependent on the rest of the global graph. This global context influences the meaning of the description of the resources found in the dataset. Ideally, the preservation of a particular dataset would involve preserving all its context. That is the entire Web of Data.
| what = At ingestion time an evaluation of the linkage of Web data dataset dump to already preserved resources is assessed. The presence of all the vocabularies and target resources in uses is sought in a set of digital archives taking care of preserving Web data. Datasets for which very few of the vocabularies used and/or resources pointed out are already preserved somewhere should be flagged as being at risk.
| outcome = A evaluation of the preservation coverage for a given dataset
| implementation = 
| test = 
| evidence = 
}}

= Depositors =

{{BP
| title = Provide data using a recognized serialisation format
| description = Data depositors should provide their data dump in a W3C standard serialisation
| why = 
| what = 
| outcome = 
| implementation = 
| test = 
| evidence = 
}}

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