XML validation can also be done using the java API. A separate package is available with all the available classes and methods. You need to use the package javax.xml.validation if you want to use these classes.

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As with other XML processing the key to this validation also is to load the XML document, you want to validate, in the Document object.

As a part of creating a document object you would need to create a DocumentBuilderFactory and then a DocumentBuilder. Then load the XML document you want to validate into the Document object.

Now our next task is to load the schema file to a schema object. For this you need to create a SchemaFactory and then create a schema object to load the schema file. Then the next step is to create a validator object to validate the document source. The validator object has a validate() method that is used to validate the document.

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