== Processing the Patient Identifer Set during a Load ==

=== Cardinality, with some examples ===

First of all, this is wrong. Every pid must have a patient_id.
{{{
<pid>
   <patient_map_id source="BRICCS">BPt00000040</patient_map_id>
   <patient_map_id source="UHLT">Snnnnnnn</patient_map_id>
</pid>
}}}


This is acceptable:
{{{
<pid>
   <patient_id source="BRICCS">BPt00000040</patient_id>
   <patient_map_id source="UHLT">Snnnnnnn</patient_map_id>
</pid>
}}}


The following example is also acceptable, but implies we know the participant is either:
 * already within the CRC (and that we know the internal identifier = 2) or:
 * this is a new participant and we are ourselves assigning a new i2b2 internal identifier (= 2) for them. 
Both situations are ones we can avoid by adopting the approach of the example above, and omitting the HIVE as a source.
{{{
<pid>
   <patient_id source="HIVE">2</patient_id>
   <patient_map_id source="BRICCS">BPt00000040</patient_map_id>
   <patient_map_id source="UHLT">Snnnnnnn</patient_map_id>
</pid>
}}}