'Not equal' in SQL is '<>'. Another relatively well-known
language that uses 'and' and 'or' uses '<>' for inequality
too. Is there any other language besides XSLT+XPath that uses
both AND and '!='?
Is there any language besides XSLT+XPath that was designed for embedding
in XML, which reserves both "&" and "<" for other purposes?
This fact didn't stop designers of the language from using <=, that is <=
form less than or equal. How <= is better than <> or &?
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