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The default behavior for this function is given by the specialization SequenceFunctions::'#', for which the first operand is expected to evaluate to a sequence of values, and the second operand is expected to evaluate to an index into that sequence.

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OMG Kernel Modeling Language™ (KerML™) Version 1.0
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An index expression specifies the invocation of the indexing function '#' from the BaseFunctions library model ...
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The default behavior for this function is given by the specialization SequenceFunctions::'#', for which the first operand is expected to evaluate to a sequence of values, and the second operand is expected to evaluate to an index into that sequence.
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Default indexing is from 1 using Natural numbers. Note that parentheses are required around the second operand: sensors#(activeSensorIndex)
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However, the behavior of the '#' operator is specialized for the OrderedCollection ... and Array ... data types from the Collections library model. In this case, the first operand must be a single value of one of these data types
For an Array, the second operand is a sequence of indexes whose size is the rank of the Array (i.e., the number of dimensions of the Array): detectorArray#(n, m)
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