Validates a healthcare worker's entity ID.   If optional facility and service information is provided, validates that the healthcare worker is registered to perform the service at the indicated facility
  

import module namespace csd_bl = "https://github.com/openhie/openinfoman/csd_bl";
declare default element  namespace   "urn:ihe:iti:csd:2013";
declare variable $careServicesRequest as item() external;

(: 
   The query will be executed against the root element of the CSD document.
    
   The dynamic context of this query has $careServicesRequest set to contain any of the search 
   and limit paramaters as sent by the Service Finder
:) 

<CSD xmlns:csd="urn:ihe:iti:csd:2013"  >
  <organizationDirectory/>
  <serviceDirectory/>
  <facilityDirectory/>
  <providerDirectory>
    {
      let $facility_entityID := $careServicesRequest/facility[1]/@entityID
      let $service_entityID := $careServicesRequest/facility[1]/service[1]/@entityID
	  
      (: if no provider id was provided, then this is invalid. :)
      let $provs0 := if (exists($careServicesRequest/id/@entityID))
	then csd_bl:filter_by_primary_id(/CSD/providerDirectory/*,$careServicesRequest/id)
      else ()   

      let $provs1 := if (exists($facility_entityID) and count($provs0) = 1)
	then 
	   if (count ($provs0[1]/facilities/facility[@entityID = $facility_entityID]) > 0) then $provs0 else ()
	else $provs0

      let $provs2 := if (exists($service_entityID) and count($provs1) = 1)
	then 
	   if (count ($provs1[1]/facilities/facility[upper-case(@entityID) = upper-case($facility_entityID)]/service[upper-case(@entityID) = upper-case($service_entityID)]) > 0) then $provs1 else ()
	else $provs1

      return if (count($provs2) = 1) then
	<provider entityID='{$provs2[1]/@entityID}'/>
      else 
	 ()
    }     
  </providerDirectory>
</CSD>