Source code: Class package.html part of poi version 3.17
record aggregates are not real "records" but collections of records that act as a single record.
This is an optimization basically.
Related Documentation
For overviews, tutorials, examples, guides, and tool documentation, please see:
@see org.apache.poi.hssf.record
@see org.apache.poi.hssf.eventmodel
@see org.apache.poi.hssf.record.RecordFactory