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The reduced XPath language as defined in Section 3.1.12, “Logical Expressions and
Navigation,? on page 3-25 is used to describe the condition_logic. This allows
description of a path through a data structure picking up property values to be used in a logical expression.
A common case is property values at objects associated with a source, hence the starting point for navigation is the source.
An example from the CIM model where the
Measurement is the source can be found in Figure 4-3 on page 4-6.
Examples how to use DAIS_Expressions starting from a source are shown below:
Measurement.value < 500 assuming that the tested value is an element at the source.
MeasurementValue[id(MeasurementValue.MeasurementValueSource)/label='telemetry']/ MeasurementValue.value < id(Measurement.LimitSets)[LimitSet.label
= 'summer']/Limit[label = 'highalarm']/Limit.value
Based on the model in Figure 4-3 on page 4-6, the XML example in Section 3.1.12,
“Logical Expressions and Navigation,? on page 3-25 and the source as a Measurement.