Which Boolean operator is not a standard operator but is supported in some search systems?

Which Boolean operator is not a standard operator but is supported in some search systems?

• A. AND
• B. OR
• C. NOT
• D. XOR

Answer: (D)

In search query language, the default set of Boolean operators you’ll see everywhere is AND, OR, and NOT. XOR stands for exclusive OR and is not part of that standard trio. It’s an extension you might encounter in some search systems. The idea is that XOR returns true only when exactly one of the terms is present, not both. That means a query using XOR would match documents that mention one term or the other, but not documents that mention both terms. Because this behavior isn’t universally supported and isn’t considered one of the core operators, it’s the nonstandard option that occasional systems add as an extra feature.

In search query language, the default set of Boolean operators you’ll see everywhere is AND, OR, and NOT. XOR stands for exclusive OR and is not part of that standard trio. It’s an extension you might encounter in some search systems. The idea is that XOR returns true only when exactly one of the terms is present, not both. That means a query using XOR would match documents that mention one term or the other, but not documents that mention both terms. Because this behavior isn’t universally supported and isn’t considered one of the core operators, it’s the nonstandard option that occasional systems add as an extra feature.