Validating xml using sax parser speed dating in cairns
provides default implementation of Content Handler interface and we can extend this class to create our own handler. The important methods to override are method is called.
It’s advisable to extend this class because we might need only a few of the methods to implement. We are overriding this method to set boolean variables that will be used to identify the element.
However, once you learn the API for validating DOM documents against RELAX NG schemas (for instance), you can use the same API to validate JDOM documents against W3C schemas. Schema Instance(Schema Factory.java:186) at Docbook RELAXNGCheck.main(Docbook RELAXNGCheck.java:14) This isn't a closed list.
For example, Listing 2 shows a program that validates Doc Book documents against Doc Book's RELAX NG schema. The only things that have changed are the location of the schema and the URL that identifies the schema language. Implementations are free to add other URLs to this list to identify other schema languages.
DTDs and XSD were normally accessed as configuration options in Simple API for XML (SAX), Document Object Model (DOM), and Java™ API for XML Processing (JAXP). Schematron might use the Transformations API for XML(Tr AX); and still other schema languages required programmers to learn still more APIs, even though they were performing essentially the same operation.
Java 5 introduced the package to provide a schema-language-independent interface to validation services.
The validator can create such type-augmented documents and write them onto a This procedure can't transform an arbitrary source into an arbitrary result.
It doesn't work at all for stream sources and results.
(This description is painted with broad strokes -- there are exceptions.)Until recently, the exact Application Programming Interface (API) by which programs requested validation varied with the schema language and parser.
Extending this class will keep our code cleaner and maintainable. We are also using this method to create a new Employee object every time Employee start element is found.
Let’s jump to the SAX parser example program now, I will explain different features in detail later on. Check how id attribute is read here to set the Employee Object package com.sax; import
This is useful for adding constraints that are more easily checked in a Turing-complete language like Java than in a declarative language like the W3C XML Schema language.
You can define a mini-schema language, write a quick implementation, and plug it into the validation layer.