This allows for operations on a class, like deleting an element and all its properties. There are a number of routines to acces the data. This is the main routine to acces data on the database. The data can either be read or written with this routine. The index, for the data item, accessed is index Integer data is accessed via the ival array.
Double data is accessed via the dval array.
The length of the data item is contained in length . If the data is read, the length is returned. If the data is written, the length should be set. The version of the data should be set in version . See the discussion of versions in a seperate section below.