Can a URL contain a semicolon and still be valid?

A semicolon is reserved and should only for its special purpose (which depends on the scheme).

Section 2.2:

Many URL schemes reserve certain characters for a special meaning: their appearance in the scheme-specific part of the URL has a designated semantics. If the character corresponding to an octet is reserved in a scheme, the octet must be encoded. The characters “;”, “/”, “?”, “:”, “@”, “=” and “&” are the characters which may be reserved for special meaning within a scheme. No other characters may be reserved within a scheme.

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