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The monitor programming model receives data coming from external events, extracts these data, and maps them to metrics that may trigger other operations to occur. Expressions play an important role; they produce the values used in the monitor model and dictate the overall flow of the monitor model logic. One can define what values are eventually stored, how and when certain operations or events can take place, what events to process, and what monitor context instances to operate on - all by using XPath expressions. Previously, expressions were built mainly from event data, previously computed expressions, and built-in XPath functions. WebSphere Business Monitor V6.1 has introduced the notion of a User-Defined XPath Function (UDXF).
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