I have created a new class to take an OpenDocument Spreadsheet (Calc) in Biblio format (e.g. as exported by JabRef to ODS) and import it into JabRef. I created this out of necessity, so no worries if it's of no use to any one but me.
Nice Office Access API
There is a more detailed description in the file OpenDocumentSpreadSheetImport.java .
New file net.sf.jabref.imports.OpenDocumentSpreadSheetImport.java
Updated file (to include above)
Updated file (to provide type in both directions)
All suggestions welcome.