How to create an if-then-else expression (aka ternary operator) in an XPath 1.0 expression?

(Lucas Jellema) There are situations where I have to create an XPath expression that performs something like if-then-else logic (similar to a CASE or DECODE expression in SQL or a ternary operator in Java or JavaScript). Unfortunately, XPath 1.0 – a version still widely found – does not support the

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