GDPDM pending issues as of May 10, 2004.
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- Do we need field season in the div_obs_unit table?

- How do we need to handle "phase determined"?  This was
  a field in the div_allele_assay table, but phase matters
  over mulitple assays.

- Need to evaluate the definition of field quality in
  table div_allele.  We may want to have a table
  that constrains quality_type?

- Do we need a parent_id field in the div_allele table?
  This would identify the raw data used to determine
  the allele.

- Need to make sure assignment of required/not required
  fields are appropriate.

- Need some way to group together multiple passports.
  Maybe another table like div_passport_group with
  fields div_passport_group_id, group_name.  And, another
  table to handle the many-to-many relationship
  named div_passport_set with fields div_passport_set_id,
  div_passport_group_id, div_passport_id.