At this form you can retrieve lists of record identifiers (headers), by indicating datestamps range, set and metadata format of the records.

Datestamps (From and Until) are given as yyyy-mm-dd.

List of sets available at the repository: http://oai.bn.pt/listSets.html.

List of formats available at: http://oai.bn.pt/listMetadataFormats.html

If datestamp fields are left blank, indicating the set and metadata format will retrieve all headers from a given set.

Example 1:

To obtain identifiers of all records from the NLP catalogue in Dublin Core:

Set:	jornais
MetadataPrefix:	oai_dc

Example 2:

To obtain identifiers of the 2017 records from the NLP catalogue in marcxchange format:

From:	2017-01-01
Until:	2017-12-31
Set:	catalogo
MetadataPrefix:	marcxchange