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Stax2 API is an extension to basic Stax 1.0 API that adds significant new functionality, such as full-featured bi-direction validation interface and high-performance Typed Access API.

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package org.codehaus.stax2.validation;

import javax.xml.stream.XMLStreamException;

/**
 * Interface that defines API that Stax2 validation system exposes to the
 * applications. It is implemented by stream readers and writers.
 *
 * Interface defines methods for starting and stopping
 * validation against specific schemas, or validator instances, as well
 * as method(s) for adding an optional custom problem handler.
 */
public interface Validatable
{
    /**
     * Method that will construct a {@link XMLValidator} instance from the
     * given schema (unless a validator for that schema has already been
     * added),
     * initialize it if necessary, and make validatable object (reader,
     * writer)
     * call appropriate validation methods from this point on until the
     * end of the document (that is, it's not scoped with sub-trees), or until
     * validator is removed by an explicit call to
     * {@link #stopValidatingAgainst}.
     *

     * Note that while this method can be called at any point in output
     * processing, validator instances are not required to be able to handle
     * addition at other points than right before outputting the root element.
     *
     * @return Validator instance constructed, if validator was added, or null
     *   if a validator for the schema has already been constructed.
     */
    public XMLValidator validateAgainst(XMLValidationSchema schema)
        throws XMLStreamException;

    /**
     * Method that can be called by application to stop validating
     * output against a schema, for which {@link #validateAgainst}
     * was called earlier.
     *
     * @return Validator instance created from the schema that was removed,
     *   if one was in use; null if no such schema in use.
     */
    public XMLValidator stopValidatingAgainst(XMLValidationSchema schema)
        throws XMLStreamException;

    /**
     * Method that can be called by application to stop validating
     * output using specified validator. The validator passed should be
     * an earlier return value for a call to {@link #validateAgainst}.
     *
     * Note: the specified validator is compared for identity with validators
     * in use, not for equality.
     *
     * @return Validator instance found (ie. argument validator)
     *   if it was being used for validating current document; null if not.
     */
    public XMLValidator stopValidatingAgainst(XMLValidator validator)
        throws XMLStreamException;

    /**
     * Method that application can call to define a custom handler for
     * validation problems encountered during validation process.
     *
     * @param h Handler to install, if non null; if null, indicates that
     *   the default (implementation-specific) handling should be used
     *
     * @return Previously set validation problem handler, if any; null
     *   if none was set
     */
    public ValidationProblemHandler setValidationProblemHandler(ValidationProblemHandler h);
}