Stax validating parser
If the parser is not able find a schema or if the XML document does not conform to the schema, an error is raised.Next, create an XMLSchema object from the schema document with which an XML document is to be validated.The choice of validation method depends on the additional functionality required in the validation application.SAXParser is recommended if SAX parsing event notification is required in addition to validation with a schema.The procedure to obtain an XMLSchema object is shown in the following listing: XSDBuilder builder = new XSDBuilder(); Input Stream input Stream=new File Input Stream(new File("catalog.xsd")); Input Source input Source=new Input Source(input Stream); XMLSchema schema = builder.build(input Source); As in the previous section, define an error handling class, Custom Error Handler that extends Default Handler class.Create an object of type Custom Error Handler, and register the Error Handler object with the SAXParser as shown here: Parses an XML document from an sax. The Input Source-based parse method is the preferred method because SAX parsers convert the input to Input Source no matter what the input type is.
To demonstrate error handling, add a title element to the journal element.
Additionally, some kinds of XML processing simply require having access to the entire document.
XSLT and XPath, for example, need to be able to access any node at any time in the parsed XML tree.
Editors and browsers likewise need to be able to display, modify, and perhaps re-validate at any time.
While a SAX parser may well be used to construct such a tree initially, SAX provides no help for such processing as a whole.
Search for stax validating parser:
Virtually any kind of XML validation requires access to the document in full.