When a DTD or other external file is referenced from a document, the reference can be specified in three ways: using a public identifier, a system identifier, or both.
Public Identifiers: -//OASIS//DTD DocBook V3.1//EN
System Identifiers: /usr/local/sgml/docbook/3.1/docbook.dtd
In XML, System Identifiers must be URIs. such as file:///usr/local/sgml/docbook/3.1/docbook.dtd. or "http://nwalsh.com/docbook/xml/1.3/db3xml.dtd".
-- Comments are delimited by pairs of double-hyphens, as in SGML and XML comments. -- OVERRIDE YES SGMLDECL "n:/share/sgml/docbook/3.1/docbook.dcl" DOCTYPE BOOK n:/share/sgml/docbook/3.1/docbook.dtd PUBLIC "-//OASIS//DTD DocBook V3.1//EN" n:/share/sgml/docbook/3.1/docbook.dtd SYSTEM "http://nwalsh.com/docbook/xml/1.3/db3xml.dtd" n:/share/sgml/Norman_Walsh/db3xml/db3xml.dtd
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