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It's like saying, don't just teach the syntax, teach the semantics. It's rather obvious. The two can't be separated, because they are the same thing from two different perspectives.

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Your comment doesn't make any sense. Syntax and semantics aren't the same thing. That is like saying freeway and tunnel are the same thing from a different perspective.

At least in programming, syntax is structure. A structure can have substructures. If the whole structure has a different meaning than each substructure on its own, then syntax has meaning. Vise-versa, how could you tell the structure of something that doesn't have any meaning to you? How do you know the meaning of a word without knowing the grammar and context? The context is the perspective.

I didn't come up with syntax semantics duality myself and I can't really explain it, because it's actually rather mathematical.

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