The filter expression routing rule lets you filter messages based on their payload. If the filter expression for a given message instance evaluates to true, the message is delivered to the target service or event specified within the routing rule.

For example, you route your data to customers in two different countries, such as US and Canada, but you only want notices regarding the MOBILE product line to be sent to US customers and the LANDLINE product line to customers in Canada. To implement this routing, you must define a routing rule for each component and operation pair that sends messages to the target customers. In addition, you specify filter expressions for the routing rules that send messages to the customers in the US or Canada.

You can also define filter expression message properties or message headers.

Filter Expression Message Properties

Two examples of filter expression message properties are shown below:

$in.property.custom.Priority = '1'

$in.property.tracking.ecid = '2'

Filter Expression Message Headers

Two examples of filter expression message headers are shown below:

$in.header.wsse_Security/wsse:Security/Priority = '234'

$in.header.wsse_Security/wsse:Security/Priority = '234'

For the preceding filter expression message headers to work, you must add the attribute shown in the following example to the root element of the .mplan file.

wsse = "http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-
 secext-1.0.xsd"