isDefined: Check if an element is defined

In NCEAS/metadig-r: Author MetaDIG checks in R

Check if an element is defined

Description

This function checks the value returned from an mdqe xpath selector.

Usage

isDefined(variableName, variable = NA, pos = as.integer(1))

Arguments

variableName	The name of the variable that contains selected values.
variable	The variable that contains selected values.
pos	The list element to check.

Details

This check can be used to test values from a selector that uses a subSelector. The value returned from this type of selector is a list that could possibly contain elements that have no defined value, i.e. the subSelector will return NA if the xpath it is trying to select is not present. The 'pos' argument can be used to check a specific value of such a list.

Value

logical

NCEAS/metadig-r documentation built on June 17, 2022, 5:09 a.m.