multiple value types (array or vector)

[GoogleCodeExporter]

In the SimDB model, a property / parameter has both a datatype and a
cardinality describing the concrete values.

Single values can be defined both as a string value or a Quantity (numeric
+ unit).

However, a cardinality (0..n or 1..n) allows multiple values like arrays or
vectors but there is no existing datatype to store that kind of values for
now. 

The only dirty workaround is to store those values as a string with a
separator e.g 1,2,3,4,5 or 1 2 3 4 5 ... 

Maybe we could use the same format as VOTable does.

Original issue reported on code.google.com by [email protected] on 12 Aug 2009 at 8:12