Debatching in xmlDisassembler using envelope schema, failing on empty message

Question

I am debatching an incoming xml messages in BizTalk receive pipeline using an envelope schema. The debatching works well for any xml that contains the sub message I am trying to debatch but fails if the message does not contain any sub message.

I have set the "min occurs" to 0 and nillable = true in the schema for the elements that are in the xpath for debatching. In the sample below the "entry" and "resource" elements have min occurs set to 0, which I thought would let the debatching function work when there is nothing to be debatched.

Here is the annotation for the envelope schema.

<xs:annotation>
   <xs:appinfo>
     <schemaInfo xmlns="http://schemas.microsoft.com/BizTalk/2003" is_envelope="yes"/>
   </xs:appinfo>
</xs:annotation>
<xs:element name="Bundle">
   <xs:annotation>
      <xs:appinfo>
         <recordInfo xmlns="http://schemas.microsoft.com/BizTalk/2003" body_xpath="/*[local-name()='Bundle' and namespace-uri()='']/*[local-name()='entry' and namespace-uri()='']/*[local-name()='resource' and namespace-uri()='']"/>
     </xs:appinfo>
</xs:annotation>

Example message with no messages to debatch

<Bundle >
   <type value="searchset"/>
   <total value="0"/>
</Bundle>

Example of xpath for debatching when sub messages are present.

<Bundle >
   <type value="searchset"/>
   <total value="46"/>
   <entry>
       <resource>
           <Encounter>

Any message that contains the entry/resource/encounters element debatches successfully, but the messages that do not contain the "entry" element ( has no messages to debatch) throw the error below.

Reason: This Disassembler cannot retrieve body nodes using this XPath: "/[local-name()='Bundle' and namespace-uri()='']/[local-name()='entry' and namespace-uri()='']/[local-name()='resource' and namespace-uri()='']". /[local-name()='Bundle' and namespace-uri()='']/[local-name()='entry' and namespace-uri()='']/[local-name()='resource' and namespace-uri()='']

I would expect the messages with nothing to debatch to simply "disappear", but instead I end up with an error in group hub. Any ideas or suggestion on how to get rid of this error would be greatly appreciated.

Answer 1

You can use below body_xpath to extract only the 'Bundle' with 'entry' records

body_xpath="/*[local-name()='Bundle' and namespace-uri()=''][*[local-name()='entry' and namespace-uri()=''][count(*)>0]]/*[local-name()='entry' and namespace-uri()='']/*[local-name()='resource' and namespace-uri()='']"

or

body_xpath="/*[local-name()='Bundle' and namespace-uri()=''][*[local-name()='entry' and namespace-uri()=''][count(*)>0]]/*[local-name()='entry' and namespace-uri()='']/*[local-name()='resource' and namespace-uri()='']"