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/usr/share/xml/docbook/schema/dtd/4.0/catalog.xml is in docbook-xml 4.5-8.

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The actual contents of the file can be viewed below.

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<?xml version='1.0'?>
<!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">

<!-- ...................................................................... -->
<!-- XML Catalog data for DocBook XML V4.0............................... -->
<!-- File catalog.xml ..................................................... -->

<!-- Please direct all questions, bug reports, or suggestions for
     changes to the docbook@lists.oasis-open.org mailing list. For more
     information, see http://www.oasis-open.org/.
  -->

<!-- This is the catalog data file for DocBook V4.0. It is provided as
     a convenience in building your own catalog files. You need not use
     the filenames listed here, and need not use the filename method of
     identifying storage objects at all.  See the documentation for
     detailed information on the files associated with the DocBook DTD.
     See XML Catalogs at http://www.oasis-open.org/committees/entity/ for
     detailed information on supplying and using catalog data.
  -->

<!-- ...................................................................... -->
<!-- DocBook driver file .................................................. -->

<public publicId="-//Norman Walsh//DTD DocBk XML V4.0//EN"
        uri="docbookx.dtd"/>

<!-- Other ways to refer to DocBook XML v4.0............................... -->
<public publicId="-//Norman Walsh//DTD DocBook XML V4.0//EN"
        uri="docbookx.dtd"/>

<system systemId="http://www.oasis-open.org/docbook/xml/4.0/docbookx.dtd"
        uri="docbookx.dtd"/>

<!-- ...................................................................... -->
<!-- DocBook modules ...................................................... -->

<public publicId="-//Norman Walsh//ENTITIES DocBook XML Notations V4.0//EN"
        uri="dbnotnx.mod"/>

<public publicId="-//Norman Walsh//ENTITIES DocBook XML Character Entities V4.0//EN"
        uri="dbcentx.mod"/>

<public publicId="-//Norman Walsh//ELEMENTS DocBook XML Information Pool V4.0//EN"
        uri="dbpoolx.mod"/>

<public publicId="-//Norman Walsh//ELEMENTS DocBook XML Document Hierarchy V4.0//EN"
        uri="dbhierx.mod"/>

<public publicId="-//Norman Walsh//ENTITIES DocBook XML Additional General Entities V4.0//EN"
        uri="dbgenent.mod"/>

<public publicId="-//Norman Walsh//DTD CALS Table Model XML V4.0//EN"
        uri="calstblx.dtd"/>

<!-- UNOFFICIAL conversion of the exchange table model to XML, based on the OASIS Exchange -->
<!--    Table Model PUBLIC "-//SGML Open//DTD Exchange Table Model 19960430//EN"           -->
<public publicId="-//Normal Walsh//Exchange Table Model 19960430 XML V4.0//EN"
        uri="soextblx.dtd"/>

<!-- the following FPI is declared for the DTD inside the DTD, but we'll -->
<!-- use the version from the latest DocBook
<public publicId="-//OASIS//DTD XML Exchange Table Model 19990315//EN"
        uri="soextblx.dtd"/> -->

<!-- End of catalog data for DocBook XML V4.0 ............................. -->
<!-- ...................................................................... -->

</catalog>