<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE catalog PUBLIC "-//OASIS//DTD Entity Resolution XML Catalog V1.0//EN" 
  "http://www.oasis-open.org/committees/entity/release/1.0/catalog.dtd">
  
<catalog xmlns="urn:oasis:names:tc:entity:xmlns:xml:catalog"
         prefer='public'>
  
  <public publicId="-//NLM//external dtd dummy public id//EN"
          uri="external.dtd"/>
  
  
</catalog>
