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This report describes the work done by FREYA work package 2 (WP2) on the PID Graph, one of the pillars of the FREYA project. It summarizes the early work on identifying user stories, describes the decisions about which technical architecture to implement, the work on launching a pre-release version of PID Graph core infrastructure in May 2019 in the form of a GraphQL API, and the work on refining this API until the launch of a production grade version in May 2020. This work has not been reported in detail elsewhere.
FREYA, PID, DataCite, PID graph
FREYA, PID, DataCite, PID graph
| selected citations These citations are derived from selected sources. This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically). | 0 | |
| popularity This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network. | Average | |
| influence This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically). | Average | |
| impulse This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network. | Average |
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| downloads | 7 |

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