Schema Validation of XML Payload Messages

This Message Queue feature enables validation of the content of a text (not object) XML message against an XML schema at the point the message is sent to the broker.

When XML validation is enabled, the Message Queue client runtime will attempt to validate an XML message against specified XSDs before sending the message to the broker. The location of the XML schema (XSD) is specified as a property of a Message Queue destination. If the specified schema cannot be located or the message cannot be validated, the message is not sent, and an exception is thrown.

If no XSD location is specified, the DTD declaration within the XML document is used to perform DTD validation. (XSD validation, which includes data type and value range validation, is more rigorous than DTD validation.)

Client applications using this feature should upgrade Java SE version to JRE 1.5 or above.

XML schema validation is enabled using the following physical destination properties: validateXMLSchemaEnabled, XMLSchemaURIList, and reloadXMLSchemaOnFailure. These properties are described in Chapter 17, Physical Destination Property Reference, in Sun Java System Message Queue 4.3 Administration Guide. The property values can be set at destination creation or update time by using the imqcmd create dst or imqcmd update dst command, respectively. The XML validation properties should be set when a destination is inactive: that is, when it has no consumers and producers, and when there are no messages in the destination.

If any of the XML validation properties are set while a destination is active (for example, if a producer is connected to the destination), the change will not take effect until the producer reconnects to the broker. Similarly, if an XSD is changed, as a result of changing application requirements, all client applications producing XML messages based on the changed XSD must reconnect to the broker.

If the reloadXMLSchemaOnFailure property is set to true and XML validation fails, then the Message Queue client runtime will attempt to reload the XSD before attempting again to validate a message. The client runtime will throw an exception if the validation fails using the reloaded XSD.