The 'Attribute Has a Value' test in the Tester will pass features where...

• A. The attribute is not null
• B. The attribute is not empty
• C. The attribute is not missing
• D. The attribute is not null, AND is not empty, AND is not missing

Answer: (D)

A value in an attribute means the feature actually carries data in that field. In FME, an attribute can be in a few non-values states: Null (no value assigned), Empty (a zero-length value, such as an empty string or empty list), or Missing (the attribute doesn’t exist on the feature). For the tester to pass, the attribute must truly have content, which requires it to be neither Null, nor Empty, nor Missing. Only when all three conditions are true is the attribute considered to have a value. This is why the correct answer requires not null, not empty, and not missing—the combination ensures the attribute contains real data.