| isTrueVal | R Documentation | 
This function checks the value returned from an mdqe xpath selector.
isTrueVal(variableName, variable, pos = as.integer(1))
| variableName | The name of the variable that contains selected values. | 
| variable | The variable that contains selected values. | 
| pos | The list element to check. | 
If the variable is not defined or the value is NA, then FALSE
is returned. TRUE is only returned if the value is present and is TRUE.
logical
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