<!DOCTYPE book SYSTEM "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"> <?xml-stylesheet href="http://www.example.org/styles/style.xsl" type="text/css"?> <book>…</book>
Becomes
<!DOCTYPE book SYSTEM "/path/to/docbookx.dtd"> <?xml-stylesheet href="/local/copy/of/style.xsl" type="text/css"?> <book>…</book>