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Subject: DOCBOOK-APPS: Re: I'm a little bit confused...
/ Giuseppe Greco <giuseppe.greco@bluewin.ch> was heard to say: | 1. When should I use PUBLIC identifiers | respectively SYSTEM identifiers? In your documents, you should always use both. In catalogs, it may be handy to map both. My catalog contains: <public publicId="-//OASIS//DTD DocBook XML V4.2//EN" uri="/share/doctypes/docbook42/xml/docbookx.dtd"/> <system systemId="http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd" uri="/share/doctypes/docbook42/xml/docbookx.dtd"/> | 2. When my document starts like this: | | <?xml version='1.0'?> | <!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN" | "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"> | <book> | ... | </book> | | ... what happens if I use a catalog like this? | | <!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"> | <group prefer="public" xml:base="/usr/share/sgml/docbook/xml-dtd/"> | "-//OASIS//DTD Entity Resolution XML Catalog V1.0//EN" | uri="docbookx.dtd"/> | </group> | </catalog> That catalog isn't valid. You probably meant: <?xml version='1.0'?> <!DOCTYPE catalog "-//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"> <group prefer="public" xml:base="/usr/share/sgml/docbook/xml-dtd/"> <public publicId="-//OASIS//DTD DocBook XML V4.2//EN" uri="docbookx.dtd"/> <system systemId="http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd" uri="docbookx.dtd"/> </group> </catalog> | Does the XML processor look in the catalog for an entry identified by | "-//OASIS//DTD Entity Resolution XML Catalog V1.0//EN", and then, if | that entry doesn't exist, look at "http://www.oasis-open.org | /committees/entity/release/1.0/catalog.dtd"? Since you've said prefer=public, the resolver begins by looking for a matching public identifier. It finds one and therefor it resolves the DTD for your document to "/usr/share/sgml/docbook/xml-dtd/docbookx.dtd". Had you omitted the public identifier from the DocType declaration, it would have found the matching system identifier and done the same thing. | 3. What the right way to proceed if I want to create my PUBLIC/SYSTEM | identifiers? Create them for your own resources? Or create them in the catalog? Or...I'm not sure what you're asking. Be seeing you, norm -- Norman Walsh <ndw@nwalsh.com> | Vision is the art of seeing things http://www.oasis-open.org/docbook/ | invisible.--Swift Chair, DocBook Technical Committee |
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