A better way to specify catalogs is to provide a properties file with a relative path to the catalog entry files. To prove that no net connection is required, I have written a JUnit test that runs with a security manager that blocks all net access.This test, along with all the other examples in this article, is available in the download.
Protection Domain$1Intersection Privilege(Protection Domain.java:76) Event Dispatch Events For Filter(Event Dispatch Thread.java:128)
Event Dispatch One Event For Filters(Event Dispatch Thread.java:211)
Must qualify the allocation with an enclosing instance of type Sax Xml Parser (e.g.
SAXParser Factory spfactory = SAXParser Instance(); Schema Factory schema Factory = Schema Instance(XMLConstants.
This article looks at how to use the Resolver classes with JAXP by working through three XML processing examples that cover the main capabilities of XML Catalogs.
XML Catalogs is currently an OASIS Committee Specification, which is a draft specification on track to becoming an OASIS Standard.
Here is the simplest catalog entry file, called catalog.xml, that can be used to resolve the public identifier for an XHTML document to a local copy of the XHTML 1.0 DTD: entry that describes a mapping between the public identifier of an entity -- in this case -//W3C//DTD XHTML 1.0 Strict//EN -- and a preferred URI to locate the entity -- in this case the file catalog/xhtml1relative to
You need to manually download the DTD (and the referenced external entity files for XHTML) and put it in the correct local directory; the catalog simply provides the mapping, it doesn't provide automatic caching facilities.
It is a direct descendent of work done on catalogs for SGML systems, the current standard being the OASIS Technical Resolution TR9401 plain-text catalog format.
This standard can also be used for XML applications; indeed the xml-commons Resolver supports TR9401 catalogs too, although they are not covered in this article.
Default Handler; public class Parser extends Default Handler sax.