/etc/xml/catalog, /etc/xml/docbook The above installation script creates the files and updates the catalog. We need to make additional entries in order to process the BLFS book: xmlcatalog --noout --add "delegateSystem" \ "/usr/share/docbook/" \ "file:///etc/xml/docbook" /etc/xml/catalog && xmlcatalog --noout --add "delegateURI" \ "/usr/share/docbook/" \ "file:///etc/xml/docbook" /etc/xml/catalog && xmlcatalog --noout --add "rewriteSystem" \ "/usr/share/docbook" \ "file:///usr/share/xml/docbook/xml-dtd-&DocBook-version;" \ /etc/xml/docbook && xmlcatalog --noout --add "rewriteURI" \ "/usr/share/docbook" \ "file:///usr/share/xml/docbook/xml-dtd-&DocBook-version;" \ /etc/xml/docbook In order to install ScrollKeeper or to utilize DocBook XML DTD V4.2 when V4.1.2 is requested in the System Identifier, make the following entry: xmlcatalog --noout --add "public" \ "-//OASIS//DTD DocBook XML V4.1.2//EN" \ "http://oasis-open.org/docbook/xml/4.1.2/docbookx.dtd" \ /etc/xml/docbook && xmlcatalog --noout --add "delegateSystem" \ "http://www.oasis-open.org/docbook/xml/4.1.2/" \ "file:///etc/xml/docbook" /etc/xml/catalog && xmlcatalog --noout --add "delegateURI" \ "http://www.oasis-open.org/docbook/xml/4.1.2/" \ "file:///etc/xml/docbook" /etc/xml/catalog && xmlcatalog --noout --add "rewriteSystem" \ "http://www.oasis-open.org/docbook/xml/4.1.2" \ "file:///usr/share/xml/docbook/xml-dtd-&DocBook-version;" \ /etc/xml/docbook && xmlcatalog --noout --add "rewriteURI" \ "http://www.oasis-open.org/docbook/xml/4.1.2" \ "file:///usr/share/xml/docbook/xml-dtd-&DocBook-version;" \ /etc/xml/docbook