From NSDLWiki

NDR-API 2.0 Use Cases

• Administrative Support Objects (expected to exist prior to Use Cases scenarios)

Collections

• Use Case: Building a Library Collection, with Three Sources of Metadata, for a Digital Library
• Use Case: Building a Library Collection, with WFI Managed Metadata only, for a Digital Library
• Use Case: Building a Library Collection, with OAI Managed Metadata only, for a Digital Library
• Use Case: Building a Library Collection, with NCS Managed Metadata only, for a Digital Library
• Use Case: Building a Collection, with NCS Managed Metadata only, for non-NSDL use
• Use Case: Building a Curriculum Customization Service (CCS) Style Learning Application

Metadata

• Use Case: A Resource with one Metadata Record
• Use Case: A Resource with multiple Metadata Records
• Use Case: Multiple Resources sharing one Metadata Records

Question:

• Can you have a instance of a Metadata Record that lives in multiple collections?

Annotations

• Use Case: Annotation of a Collection
• Use Case: Annotation of Metadata
• Use Case: Annotation of a Resource