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Hi everyone,

I'm struggling with the extraction of information from the following XML:

<Bundle xmlns="http://hl7.org/fhir">
  <id value="b35061d2-7bf1-11ef-a57c-005056b65e2f"/>
  <type value="transaction-response"/>
  <timestamp value="2024-09-26T10:10:43Z"/>
  <entry>
    <resource>
      <Observation>
        <id value="2005"/>
        <meta>
          <versionId value="1"/>
          <lastUpdated value="2024-09-26T10:10:43Z"/>
        </meta>
        <status value="final"/>
        <code>
          <coding>
            <system value="urn:oid:2.16.840.1.113883.6.1"/>
            <code value="1-8"/>
            <display value="Acyclovir [Susceptibility]"/>
          </coding>
        </code>
        <subject>
          <reference value="Patient/5978971"/>
        </subject>
        <effectiveDateTime value="2024-09-09T13:20:24Z"/>
        <valueCodeableConcept id="5670">
          <coding>
            <system value="urn:oid:2.16.840.1.113883.6.103"/>
            <code value="612.5"/>
            <display value="Prova"/>
          </coding>
        </valueCodeableConcept>
        <interpretation>
          <coding>
            <code value="Media"/>
          </coding>
        </interpretation>
        <bodySite>
          <coding>
            <system value="urn:oid:2.16.840.1.113883.12.163"/>
            <code value="LA"/>
            <display value="Braccio sinistro"/>
          </coding>
        </bodySite>
      </Observation>
    </resource>
    <response>
      <status value="201"/>
      <location value="https://fser-test.regione.veneto.it/PROXYFHIR/r4/Observation/2005"/>
      <etag value="W/&quot;1&quot;"/>
      <lastModified value="2024-09-26T10:10:43Z"/>
    </response>
  </entry>
  <entry>
    <resource>
      <Observation>
        <id value="2006"/>
        <meta>
          <versionId value="1"/>
          <lastUpdated value="2024-09-26T10:10:43Z"/>
        </meta>
        <status value="final"/>
        <code>
          <coding>
            <system value="urn:oid:2.16.840.1.113883.6.1"/>
            <code value="1-8"/>
            <display value="Acyclovir [Susceptibility]"/>
          </coding>
        </code>
        <subject>
          <reference value="Patient/5978971"/>
        </subject>
        <effectiveDateTime value="2024-09-09T13:20:24Z"/>
        <valueCodeableConcept id="5670">
          <coding>
            <system value="urn:oid:2.16.840.1.113883.6.103"/>
            <code value="612.5"/>
            <display value="Prova"/>
          </coding>
        </valueCodeableConcept>
        <interpretation>
          <coding>
            <code value="Media"/>
          </coding>
        </interpretation>
        <bodySite>
          <coding>
            <system value="urn:oid:2.16.840.1.113883.12.163"/>
            <code value="LA"/>
            <display value="Braccio sinistro"/>
          </coding>
        </bodySite>
      </Observation>
    </resource>
    <response>
      <status value="201"/>
      <location value="https://fser-test.regione.veneto.it/PROXYFHIR/r4/Observation/2006"/>
      <etag value="W/&quot;1&quot;"/>
      <lastModified value="2024-09-26T10:10:43Z"/>
    </response>
  </entry>
</Bundle>

I'm doing:

set Bundle = ##class(A2Lib.FHIR.v400.Bundle).%New()
do reader.Correlate("Bundle","A2Lib.FHIR.v400.Bundle")
do reader.Next(.Bundle,.st)
        
for e=1:1:Bundle.entry.Count(){
            set locationValue = Bundle.entry.GetAt(e).response.location.value
... ...

But locationValue remain empty.

Can someone help me about what I'm doing wrong? 

Thank you