The Underlay is a free and open source system for structuring, storing, and aggregating open, distributed graph data. One goal of the project is to make machine-readable public knowledge accessible to all as a public good.
The world is full of datastores and linked data. Where we once relied on a data source to be producer, curator, ontologist, and analyst in one, now each of these steps can be carried out independently, by multiple sources and at different times. This flexibility expands the breadth, reach, and reusability of collective knowledge.
We can separate a dataverse into original observations; layers of curation, aggregation, refinement, and annotation; and application layers of interpretation and services for different audiences, each with its own provenance. This helps reusers decide what is appropriate for their context.