Examples:
Paperbuzz – Assessments of papers
Cobaltmetrics – Meta-identifier / ID-free
Tools are often built around one or two identifiers.
Streams are often built around one or two use cases (a supply of some sort of data format)
Elements:
Namespaces vs Identifiers vs Intrinsics (content/multihashes)
Identifier clusters (linking related elements)
UUID for each element
Name in namespace