If storeToRecoveryFile has not been called before, this method returns whether the document has been modified since it has been loaded respectively created.

When saving a session, either in case of a emergency (when OpenOffice.org crashed), or during a periodic session save as configured by the user, storeToRecoveryFile is called for every document where wasModifiedSinceLastSave returns true.

It's allowed to implement this method sloppy, by returning true in cases where it is not sure whether the document actually has been modified. So, the most simple implementation could simply delegate this call to ::com::sun::star::util::XModifiable::isModified. (Well, actually that's the second simple implementation, the most simple one would, still egitimately, always return true.)

However, in such a case, the document might be saved more often than needed. In particular during the periodic session save, this might become a problem when saving is expensive, for a single document or the sum of all open documents.

A default implementation of this method could simply delegate this call to ::com::sun::star::frame::XStorable::storeToURL.

The document itself has previously been created, but not loaded (via ::com::sun::star::frame::XLoadable::load) or initialized (via ::com::sun::star::frame::XLoadable::initNew).

Upon successful return, the document must be fully initialized. In particular, the caller is not responsible for calling ::com::sun::star::frame::XModel::attachResource. Instead, the implementation is responsible to do so, if required.

A default implementation of this method could simply delegate this call to ::com::sun::star::frame:::XLodable::load, followed by ::com::sun::star::frame::XModel::attachResource.