Description of problem:
The lack of cardinality definitions (ie [0..1], [1..1], etc) for
attributes has been a major source of unexpected problems & bugs in
both object type & query definitions. There is no reason aside from
laziness why an application developer should not explicitly define the
cardinality for all query & object type attributes. The PDL parser
should be changed to make cardinality compulsory. Any object types
without this information can be trivially fixed up by either
mechanically adding '[0..1]' (to preserve current default behaviour)
or examining the domain code to determine the precise requirements.

Version-Release number of selected component (if applicable):


How reproducible:


Steps to Reproduce:
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Actual results:


Expected results:
Error is thrown when an object typee / query attribute does not define
its cardinality.

Additional info: