The UCARConnect/DLESE OAI data provider has the following characteristics:
The data provider contains collections of educational resources and a collection of collection metadata (metadata about the collections). Each collection in the repository is made available as an OAI set.
Sets/collections are added and removed from the repository occasionally.
Collections of educational resource metadata make up the majority of the repository. All educational resource metadata sets/collections are available in nsdl_dc and oai_dc formats and some are also available in Information about the LAR Metadata Format format.
The contents of some sets/collections change frequently (approximately monthly), while others remain relatively static.
No deduping is performed in the data provider. It is common to see multiple metadata records that describe the same resource URL, especially across different sets/collections.