Prefixed XMLNS and exported XML from PDF

I have the following XSD sample:

<?xml version="1.0" encoding="UTF-8"?>
<xsd:schema targetNamespace="http://www.irs.gov/efile" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns="http://www.irs.gov/efile" elementFormDefault="qualified" attributeFormDefault="unqualified" version="1.0">

<xsd:annotation>
  <xsd:documentation>
  ..

  </xsd:documentation>

</xsd:annotation>

<xsd:include schemaLocation="efileTypes.xsd"/>

<!-- ===================================  ATTACHMENTS TO MESSAGES  =================================== -->

<!-- IRS Submission Manifest -->
<xsd:element name="IRSSubmissionManifest">
  <xsd:complexType>
   <xsd:sequence>

..

I am importing the XSD file into Designer and generating all possible fields. I include a button to generate XML output using Acrobat. When I load the PDF into Acrobat and generate the XML, I want the following result:

  <IRSSubmissionManifest xmlns="http://www.irs.gov/efile" xmlns:efile="http://www.irs.gov/efile">

However, no matter how I edit the XSD, I can only generate the following result:

<IRSSubmissionManifest xmlns="http://www.irs.gov/efile">

How do I get the " xmlns:efile="http://www.irs.gov/efile" " fragment to appear in the IRSSubmissionManifest element?

Thank you.