...
- Storage: Legacy storage (or Akubra)
- XML metadata : datastreams
- XML metadata : inline and metadata files
- Content models
- Datastream types (inline, managed, redirect, and external)
- Identifiers
- Indexing strategies (GSearch, RI-Search vs. F4 approaches)
- Replication/Journaling
- Security policies: XACML
- OAI-PMH
- Versions
- Disseminators
- Audit history
...