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Likewise, there are validating and nonvalidating parsers.Both parsers enforce syntactic rules but only validating parsers know how to validate documents against their DTDs or schemas.
The confusion arises because the tool that has so much visibility in the marketplace turns out to be a very low-level library. Imagine you are given an XML file with product descriptions, including prices. To loop through the prices means to read and interpret the XML syntax. Therefore, the application must read and interpret the DTD to be able to resolve entities.
As it turns out, writing a software library to decode XML files is a one-month assignment.
If you were to write such a library, after one month, you would have written your own parser.
In order to tell the SAX to check the document for validity a correspodning property of DOM-builderfactory should be set to true, like follows: // create new factory is ordinary way: Document Builder Factory factory = Document Builder Instance(); // specifies that the builder produced by this factory will // validate documents as they are parsed.
An XML document is considered ‘well-formed’ if it follows the normal rules of XML. In the example below we look at validating an XML document while using DOM, SAX and St AX.
Validation is a process of checking the source XML document to correspond to the DOCTYPE it referes.