📄️ Identify
This verb returns the main protocol information about the repository. It is the handshake used by harvesters to verify the server identity.
📄️ ListIdentifiers
Retrieves a list of headers (identifiers and datestamps) but not the full metadata records. This is used by harvesters to check for updates (using from and until dates) before downloading heavy payloads.
📄️ ListMetadataFormats
Describes the metadata formats available for records in this repository.
📄️ ListSets
Retrieves the structure of the repository. In the ABCD OAI Provider, Sets map directly to the databases configured in oai-databases.php.
📄️ ListRecords & GetRecord
These verbs deliver the actual metadata content. The oai.php script processes these requests by querying the ISIS databases via WXIS or CISIS utilities.