##OAI Index Field Description

### id 
document identifier

### document 
complete record delivered by the OAI API - as starter for memobase only Europeana EDM format 

### format
label for the format stored in the document field (for europeana edm)
could be used for oai set purposes

### published
[true|false]
indicator if document should be delivered (harvested) by the OAI API

### recordset
the data the document is part of - (Bestand) don't know if we use this for the API at the moment

### institution
institution the data belongs to


### lastUpdatedDate
timestamp necessary for harvesting (from | until)