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How do you parse/validate the XML document?- Parsing the XML document is the only way to validate the XML file.
- Validation is done by either DOM parser or the SAX parser.
- There are multiple schema-definition languages, including RELAX NG, Schematron, and the W3C "XML Schema" standard. (Even a DTD qualifies as a "schema," although it is the only one that does not use XML syntax to describe schema constraints.)
- However, "XML Schema" presents us with a terminology challenge. Although the phrase "XML Schema schema" would be precise, we will use the phrase "XML Schema definition" to avoid the appearance of redundancy.
- To be notified of validation errors in an XML document, the parser factory must be configured to create a validating parser, as shown in the preceding section. In addition, the following must be true:
1. The appropriate properties must be set on the SAX parser.
2. The appropriate error handler must be set.
3. The document must be associated with a schema.
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