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The importance of promoted properties in BizTalk Server s publish/subscribe architecture cannot be overstated. Understanding how they work is absolutely critical when designing and building an integration solution. From a simplistic perspective, a publish/subscribe integration architecture involves source systems publishing or outputting messages to a centralized hub. After the hub receives these messages, it delivers them to the destination, or subscribing, systems. Within BizTalk Server, promoted properties are the key data that determine which messages are delivered to subscribing systems or processes. Without promoted properties, messages would be received by BizTalk Server, but they would not be sent out, resulting in a sort of black hole of messages. This would obviously not be a good situation, and BizTalk Server will actually throw an error if a message is received without having a system or process that subscribes to it. This keeps with the theory that it is not a good idea for a publish/subscribe integration hub to accept messages for which it does not have a subscriber. A term that is commonly used to describe a message s promoted properties is message context. The message context includes all the instance-specific and exchange-specific data fields and essentially is the metadata that the messaging engine of BizTalk Server uses to process messages. As previously noted, instance-specific properties are those that pertain to a specific message instance, and they must be promoted explicitly during development. A common example of this type of property is an XML element containing a unique ID, which may capture an important data field such as an order number. From a message schema, XML elements, attributes, and records may be promoted.
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Note In order for an XML record to be promoted, its ContentType property must be set to SimpleContent. All
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promoted properties, regardless of whether they are populated by XML elements, attributes, or records, have a maximum length of 255 characters.
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Along with being the key data elements allowing message subscription, promoted properties are also commonly used in orchestrations to determine business process. Orchestrations can handle messages dynamically by interrogating promoted properties that hold key metadata elements of a message. For example, sales orders being delivered domestically may need to be handled differently than those being sent overseas. By capturing the destination country of an order in the document schema and flagging the element as a promoted property, this data element can easily be used as a decision point in the orchestration. Domestic orders could be handled on one branch of decision logic, and international orders handled on another. It is important to note here that as an alternative to using promoted properties, the actual XML message could be interrogated within the orchestration to determine the destination of a sales order. While this method could be used, leveraging promoted properties simplifies programming and has performance benefits, as promoted properties can be accessed directly without incurring the cost of opening the entire XML message. For additional performance gains, distinguished fields can be used as opposed to promoted properties within orchestrations. Distinguished fields provide functionality similar to promoted properties (allowing access to instance- or exchange-specific metadata items on a message), with a few key differences:
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CHAPTER 2 DOCUMENT SCHEMAS
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Distinguished fields are available only within a single orchestration instance, and they are not available to other BizTalk Server objects, such as receive locations, send ports, send port groups, and tracking utilities. Distinguished fields can be of any length; promoted properties have a maximum length of 255 characters. Distinguished fields have less of a performance impact than promoted properties, as they are not persisted to the MessageBox database. Instead, they are essentially XPath aliases, which simply point to the appropriate XML data field. Additionally, adding the DistinguishedField attribute to a field on a .NET class allows it to be exposed as a distinguished field. Distinguished fields are accessed through a reference to the name of the message, the name of the record structure containing the distinguished field (which could include multiple levels of child records), and the name of the distinguished field, with each named item separated by periods: MessageName.RecordName.ChildRecordName.DistinguishedFieldName. Promoted properties, on the other hand, are accessed through a reference to the name of the message, the name of the property schema, and a name of the promoted property, via the following format: MessageName(PropertySchemaName.PromotedPropertyName).
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Certain scenarios will call for sensitive information, such as a bank account number, to be used as a promoted property. To allow for enhanced troubleshooting and detailed reporting, promoted properties can be viewed in tools such as the Group Hub reports in the BizTalk Admin Console and Business Activity Monitor (BAM). Based on privacy regulations, these data fields may need to be hidden from these tools, which can be accomplished by setting the promoted property s Sensitive Information property to True (this configuration is applied on the property schema). System- or exchange-specific properties are those that are automatically promoted by BizTalk Server and allow the successful processing of those documents by the messaging engine. The fundamental difference between the two types of properties is that exchange-specific properties can all be determined without looking into the actual contents, or payload, of the message. Instance-specific properties, on the other hand, are all populated with actual values within a message instance. Exchange-specific properties come in various types. Table 2 1 lists the default exchange-specific property types that come with a complete installation of BizTalk Server. Additional properties may be added as other BizTalk related items are installed, such as the MQ Series adapter.
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