Writing input filters

Saxon can take its input from a JAXP SAXSource object, which essentially represents a sequence of SAX events representing the output of an XML parser. A very useful technique is to interpose a filter between the parser and Saxon. The filter will typically be an instance of the SAX2 XMLFilter class.

There are a number of ways of using a Saxon XSLT transformation as part of a pipeline of filters. Some of these techniques also work with XQuery. The techniques include:

The -x option on the Saxon command line specifies the parser that Saxon will use to process the source files. This class must implement the SAX2 XMLReader interface, but it is not required to be a real XML parser; it can take the input from any kind of source file, so long as it presents it in the form of a stream of SAX events. When using the JAXP API, the equivalent to the -x option is to call transformerFactory.setAttribute( net.sf.saxon.lib.FeatureKeys.SOURCE_PARSER_CLASS, 'com.example.package.Parser')