in reply to What is a Query String in a URL
The semantics and structure of a Query String is defined in RFC 2396
Section 3.4 talks about the Query Component of a URI.
Section 3.4 talks about the Query Component of a URI.
If you want to get a rock solid understanding of query strings read the specifications. Then you will have an easier time understanding how different applications use them.
W3C section on Naming and Addressing: URIs, URLs, ...
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