the doc('') function

Dear all,

What is the expected output of

<?xml version="1.0" encoding="UTF-8"?>
<p:declare-step xmlns:p="http://www.w3.org/ns/xproc" version="1.0">
  <p:output port="result"/>
  <p:identity>
    <p:input port="source" select="doc('')">
      <p:empty/>
    </p:input>
  </p:identity>
</p:declare-step>
Best regards,

Mohamed

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